Updated QA toolchain

[weierophinney]

• Added PHPUnit and php-cs-fixer as dev dependencies.
• Setup PSR-0 dev autoloading for tests.
• Added php-cs-fixer configuration.
• Updated Travis-CI configuration to:
  • Add testing for 5.5, 5.6, 7, and hhvm.
  • Use the phpunit and php-cs-fixer installed by composer.
  • Remove xdebug support (as we're not generating coverage).
  • Only run CS checks on 5.6.

Additionally, once the above were complete, ran php-cs-fixer without the --dry-run flag to fix CS issues.

[Maks3w]

append || return 0 to xdebug use 1.7.* as constrait of cs tool

[weierophinney]

@Maks3w —

append || return 0 to xdebug

Already did; see the most recent commit.

use 1.7.* as constrait of cs tool

~1.7.0 is functionally equivalent anyways (will install anything between 1.7.0 and 1.8.0, not including 1.8.0), and wildcards are frowned upon by the Composer team.

[Maks3w]

I don't like the DISABLE_XDEBUG config option. Alone does not have sense. Require to manual change when xdebug become available on PHP7 or HHVM

[weierophinney]

@Maks3w will the || return 0 correct for that? If so, send a PR removing the variable and the conditional.