Fix #1134 : Fix permalinks use accross application
Fix #1133 : Permalinks always expose the file extension of the original document
Enable etag in URI by default
Fix report tests
Move URL etag from permalinks to media subdef urls
Fix travis build
Fix #1137 : Phrasea install fails on step 5
Fix #1138 #1139 : Consecutive Image Tools calls may fail
Prepare version 3.7.10