Merge branch 'release/0.9.0alpha' into develop
[FEATURE] Add method "getName" in CheckInterface and AbstractCheck
[FEATURE] Define api for registering checks

You can create and define your own checks by implementing
the CheckInterface and registering your Check by using:

\TYPOVISION\ConventionCheck\Report::registerCheck(new MyCheck());
[TASK] Added Readme.md and Changelog.md
[TASK] Declare several methods of AbstractCheck final
[TASK] Adjust naming of severety types
[BUGFIX] Display linesbrakes in check messages
[BUGFIX] ExtensionInformation must return registered modules, not plugins
[FEATURE] Add checks for plugin/module controller actions accessibility

These checks search for defined controllers and their actions.
If the controller itself is missing the check displays an errors,
also if defined actions are missing or inaccessible, means private
or protected.
[TASK] Update Changelog.md
[TASK] Added important update information in Readme.md
[TASK] Adjust ext_emconf.php via ter upload
[RELEASE] Release of version 0.9.1alpha
Merge branch 'release/0.9.1alpha'