Remove PHP 5.5 from Travis configuration. Dotenv used for environment management now,
examples and tests updated to use putenv instead of define. Logger alias update to
LoggerInterface. Update mutable config API calls. Replace array declaration with
short version: []. Update license year.
* Update composer constraint for 4.x compat
* 4.x compatibility: Rename "code" to "src" and add PSR-4 autoloading
* Restructure code and tests for PSR-4
* Implement namespaces
* Implement namespaced throughout
* PSR-2 formatting updates, separate Result from CheckSuite, implement PSR-3 logging, fix tests
* FIX Routes and template location
* Update readme. Allow check classes to be namespaced or not.
* Add entry to changelog
* FIX Ensure DatabaseCheckTest always has a member. Allow strings or objects for $check in the suite
* Update readme to be clearer about passing checks with or without namespaces
* Revert namespace checking and implement Injector aliases instead. Update readme.
