Added Rule config entity class and schema stub.
Added a test case for saving an action as config entity and loading it.
Added a test case for a nested rule config and implemented getConfiguration() methods for expression plugins.
Fixed missing expression manager in PHPUnit tests.
Implemented config entity export of context definitions.
Renamed the config entity to rules_component.
Fixed unit test directory structure according to core.
Fixed changed constructor signature of DefaultPluginManager.
Enable PHP 5.6 testing on Travis CI.
Port Path Alias Delete to D8
D8 port of action alias delete
Merge pull request #105 from stevepurkiss/port-delete-any-url-alias-action-to-D8-2318653

Initial port of PathAliasDelete with test.
Merge pull request #109 from stevepurkiss/D8-port-path-alias-delete-2338595

Port Path Alias Delete to D8