Remove unused jstree checkbox
Clean up tree associate script, prevent hiding additional content in the tree container
Merge branch 'master' into PIM-2232
Merge pull request #1157 from akeneo/PIM-2232

PIM-2232 related clean-up
PIM-2262 : move the generateFilenamePrefix from ProductManager to
MediaManager
Merge pull request #1158 from akeneo/fix/move_generate_filename_prefix

PIM-2262 : move the generateFilenamePrefix method
Merge branch 'master' into feature/spreadsheet_parser