* Improve encapsulation on ERC165

* Improve encapsulation on ERC20

* Improve encapsulation on ERC721

* Add tests, use standard getters

* fix tests

* Fix lint

* move interface ids to implementation contracts

* Do not prefix getters

* Improve encapsulation on Crowdsales

* add missing tests

* remove only

* Improve encapsulation on Pausable

* add the underscore

* Improve encapsulation on ownership

* fix rebase

* fix ownership

* Improve encapsulation on payments

* Add missing tests

* add missing test

* Do not prefix getters

* Do not prefix getters

* Fix tests.

* Update modifiers to call public view functions.

Fixes #1179.

* remove isMinter

* fix is owner call

* fix isOpen

* Fix merge

* Improve encapsulation on TimedCrowdsale

* Add missing parentheses

* remove duplicate function definition