Merge pull request #332 from kaltura/IX-9.3.1-accesscontrol-api-fix

backward compatability for accessControlProfile service
Merge pull request #340 from kaltura/IX-9.3.0-SUP-886

SUP-886 #comment Add webm to list of video_file_ext array
Merge pull request #342 from kaltura/IX-9.3.0-SUP-877-ui-conf

SUP-877 Remove "confFilePath" from Kaltura ui conf Map
Merge pull request #345 from kaltura/IX-9.3.0-SUP-801

SUP-801 #comment Save caption asset item after striping invalid chars
Sesame - thumbnail background
Enabling setting the file format by passing argument "format" to the
Thumbnail action.
For instance - 
http://local.trunk/p/100/sp/10000/thumbnail/entry_id/0_q5suunqj/width/500/height/355/format/png

Requires testing thumbnails creation.

#PS-227 #time 2 h
Fixed a caching bug in case of resizing.
Merge pull request #384 from kaltura/IX-9.3.1-Thumbnail-action

Ix 9.3.1 thumbnail action