LL-234
* removed prototypical api call fileThumbGet
* new entity type thumbnail currently handled in entity service
* added thumb information for data type evernoteNote for call entityDescGet
* add evernote entities to respective user's private circle during import from evernote
* using SSFileU methods to create thumbnails for evernote notes now
* checking for whether user event content can be parsed as integer in isRatingContentCorrect in SSUE
* creating thumbnails during file uploads for docs, images and pdfs now