Added support for entityreferences which are using views for selection.
Removed image field from field formatter summary when field is not a entityreference field and libraries 2.x is required now.
Added basic support for entityreference.
Added the possibility to select which image should be used (multi value field) for Backstretch.
Added Drush integration.
Changed the way how to load the files for Backstretch.
Added possibility to select an image style and several changes.
Use version_compare() instead of variable_get() to detect jQuery version.
Added libraries module as dependency.
Complied with coding standards.
