Revert "add file and device plugin"

This reverts commit 8ddb52008cc86334194615f9a95ccb06642380be.
Fix for mobile
Show event decription
Show event location
Tracks menu
Talk detail
Only delete info for updating event
Tags on talk list and tag description
Twitter sharing integrated
Speakers page
Add twitter message to detail lightbox
User agenda first approach
@ symbol added to the speaker's hashtag
YET-ANOTHER social plugin integrated with the twitter button
Favorite talks
Mantain event list
Fix overlay
Revert "YET-ANOTHER social plugin integrated with the twitter button"

This reverts commit 4ac0833b38f1d631d086cf67fa17e36b26bdeda2.
Bugfixes
Do not swype on agenda