Added some helper methods
Check if modules could be instantiated
Uses new helper functions
Viasul awarning when a module could not be instanciated.
Fixed file input, thant should not have form-control class
Added vertical-row-space style, to add some space after a row
Ajout du vidage des caches assets, images et documents
Changed isSubclassOf by implementsInterface
Merge pull request #345 from roadster31/various-fixes

Various fixes