* Fixed unnecessary dependency of RefundableCrowdsaleImpl on ERC20Mintable.

* Added PostDeliveryRefundableCrowdsale.

* Renamed to RefundablePostDeliveryCrowdsale.

* Added deprecation warning.

* Added _transferToken.

* _transferFrom is now usable by derived contracts, abstracted away enumerable behavior.

* Removed unnecesary check from _clearApprovals

* signing prefix added

* Minor improvement

* Tests changed

* Successfully tested

* Minor improvements

* Minor improvements

* Revert "Dangling commas are now required. (#1359)"

This reverts commit a6889776.

* updates

* fixes #1404

* approve failing test

* suggested changes done

* ISafeERC20 removed

* conflict fixes

* fixes #1205

* minor change

* suggested changes

* reviewed changes

* final update

* signing prefix added

* Minor improvement

* Tests changed

* Successfully tested

* Minor improvements

* Minor improvements

* Revert "Dangling commas are now required. (#1359)"

This reverts commit a6889776.

* updates

* fixes #1404

* approve failing test

* suggested changes done

* ISafeERC20 removed

* conflict fixes

* fixes #1512

* Update test/token/ERC721/ERC721Full.test.js

Co-Authored-By: Aniket-Engg <30843294+Aniket-Engg@users.noreply.github.com>

* Added explicity pify dep, deprecating web3.eth.

* Dropped promisify in favor of pify.

* make provider creation lazy

* change getter for function

* remove unused networks from truffle config

* remove unused dotenv package

* remove truffle-hdwallet-provider dependency

* install ethereumjs-util

* replace sha3 with keccak256 for ethereumjs-util v6

* Renamed sendTransaction to send, improved API.

* Added send tests.

* Now using promisified web3

* Added advanceBlock to time, moved tests around.

* Removed the standalone advanceBlock.

* Removed the 'id' field

* Fixed linter error.

* Removed the 'latest' test, since it only works if time hasn't been fast-forwarded.

* Removed .only directive.

* transferFrom now emits an Approval event, indicating the updated allowance.

* Updated burnFrom to also emit Approval.

* Added notices about the extra Approval events.

* Added time tests.

* Minor improvements.

* Added inTransaction tests.

* Added expectEvent.inConstructor.

* Changed inTransaction, removed decodeLogs.

* Flipped comparison to improve the error message.

* Improved expectEvent tests.

* Migrated tests to use expectEvent.

* Added roles constructor tests.

* Fixed linter errors.

* Made lodash a dev dependency.

* Added more inLogs tests.

* Update expectEvent.test.js

* Removed lodash.

* Moved role constructor tests to public role behavior.

* Revert "Flipped comparison to improve the error message."

This reverts commit 438c57833d997d2972a7730180a266bc3c6a87c5.

* Replaced chai-as-promised with shouldFail.

* Added ether tests.

* Added shouldFail base function and tests.

* Updated test descriptions.

* Reduced gas limit on out-of-gas tests.

* Rolled back Travis stages

* Rolled back the rolled-back changes.

* Renamed jobs, coverage can no longer fail.

* Cleaned up the yaml file a bit.

* Updated coveralls badge.

* Added balanceDifference tests.

* Added balanceDifference tests.

* Now using balanceDifference in all (most) tests.

* Fixed typo.

* Updated code style to 4 spaces and 120 max characters per line.

* Update contracts/token/ERC721/ERC721Pausable.sol

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Update contracts/token/ERC721/IERC721.sol

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

Small change in test description, should be "allows to approve..." instead of "allow to transfer..." in approve section, where test actualy try to approve, not to transfer.

* Remove redundant require statements

Now that SafeMath uses require, the require statements are redundant. They were also previously inconsistent because they were only included in some functions, but not others

* Update ERC20.sol

* add improvement in simpletoken example #1458

* fix not calling decimals get function in initial supply

* signing prefix added

* Minor improvement

* Tests changed

* Successfully tested

* Minor improvements

* Minor improvements

* Revert "Dangling commas are now required. (#1359)"

This reverts commit a6889776.

* updates

* fixes #1404

* approve failing test

* suggested changes done

* ISafeERC20 removed

* conflict fixes

* fixes #1386

* Update SafeMath.test.js

* signing prefix added

* Minor improvement

* Tests changed

* Successfully tested

* Minor improvements

* Minor improvements

* Revert "Dangling commas are now required. (#1359)"

This reverts commit a6889776.

* updates

* fixes #1404

* approve failing test

* suggested changes done

* ISafeERC20 removed

* conflict fixes

* fixes #1456

* fix Add a comment to ERC721Enumerable #1465

* fix Add comments to ERC721Burnable #1464

* Made _clearApproval private, added clarifying comments in _addTokenTo and _removeTokenFrom.

* Added approval information.

(cherry picked from commit 8204f6a7)

This attack was reported in https://github.com/OpenZeppelin/openzeppelin-solidity/issues/877

(cherry picked from commit 80458ebc)

(cherry picked from commit 6d415c50)

(cherry picked from commit a936cbf5)

(cherry picked from commit 1ac1ac98)

* Deleted unnecessary import.

* Added back SafeMath.

* Removed another unnecessary import.

(cherry picked from commit bbe804a1)