* tests: use stages for the travis execution

Fixes #694

* add comments as suggested by @nventuro

* move the unit tests first, as suggested by @frangio

* make stages clearer as suggested by @nventuro

* tests: use stages for the travis execution

Fixes #694

* add comments as suggested by @nventuro

* move the unit tests first, as suggested by @frangio

* make stages clearer as suggested by @nventuro

* update the stage names as suggested by @frangio

* Run all tests in parallel

* added names

* Now forcing Unix linebreak style.

* Added linebreak style for Solidity files.

* make StandardToken state variables private

* simplify mocks

* document new internal functions

* fix link to ERC20 document

* revert order of Transfer and Mint events

* Revert "simplify mocks"

This reverts commit 371fe3e567e0ec894caa8d5f14ad590b18c5ae86.

* add tests for new internal functions

* add check for null account

* add checks for balances and allowance

* add inline docs to BurnableToken._burn

* remove redundant checks and clarify why

* Added non-target bounty test

* Increased ERC721 testing coverage.

* Addressed review comments.

* fix linter error

* Fixed linter error

* Removed unnecessary bouncer require

* Improved Crowdsale tests.

* Added missing SuperUser test.

* Improved payment tests.

* Improved token tests.

* Fixed ERC721 test.

* Reviewed phrasing.

* Added Math.average

* Removed assertion.

* Add Modulo operation for getting the quotient

* Improved modulo tests and implementation.

* Removed assertion.

* Made ERC721.exists internal.

* Removed exists ERC165 identifiers

used dos2unix program

* Moving towards chai.should.

* Fixed failing tests.

* Fixed linter errors.

* Revert package-lock.json changes.

* Fixed failing tests.

* s/eq/equal

* Addressed review comment

* feat: use require in SafeMath

* fix: grammar with revert

* Deploy the contract with the designated owner

* Fixed TX origin.

Use 2 ^ 256 - 1 instead that huge constant value.

This is a minor change, aligning to the same convention used in the other contracts.

* SplitPayment now requires payees.

* Improved test phrasing.

* reentrancy mutex gas optimization

* 1) uint => uint256 2) ++ to += 1

* remove Math.min64 and Math.max64

* refactor Math tests to use return values

* enhance Math coverage

* Consolidted ERC20 Interface and Implementation Files

* Fixed CanReclaimToken's tests to use StandardTokenMock instead of BasicTokenMock

* Changed token's variable type in TokenTimelock to ERC20

* Merged the StandardBurnableToken with BurnableToken since it now inherits from StandardToken; Fixed TokenTimelock so it uses SafeERC20 for ERC20

* Fixed variable type for _token in TokenTimelock constructor

* Fixed linting warning in BurnableToken

* Added back burnFrom tests.

* Changed Crowdsale inheritance order.

* Changed FinalizableCrowdsale inheritance order.

(cherry picked from commit 3d86c58d)

* Changed Crowdsale inheritance order.

* Changed FinalizableCrowdsale inheritance order.

* All tests now use account names, and dont use accounts[0] (except ERC721)

* Added account names to some missing contracts.

* Add an initial document for our code style

* Remove abbreviations from parameters

* Rename the param in AddressUtils

* fix comment

* Add an initial document for our release process

* add more detail and explanation to releasing guide

* fix details of the RELEASING.md document

* Update RELEASING.md

* Update RELEASING.md

* Update RELEASING.md

* Update RELEASING.md

* Add an initial document for our code style

* add parameter types