Pass the Composer instance when creating a new Installer class
Use getLocations() to allow installers to override default locations
CakePHP >= 3.x plugins installed under `plugins` instead of `Plugin`
Merge pull request #156 from rchavik/cake3

Updating CakePHPInstaller for upcoming version 3.0
Fixed link to Moodle installers source code
Merge pull request #157 from Mihailoff/patch-1

Fixed link to Moodle installers source code