BK-1288 Thumbnails for certain cover types or error thumbnail are broken

Inserted images to new position and corrected paths
BK-1185 Show user chat in the editor
Merge branch 'BK1185' into 2.0
Merge branch 'BK1288' into 2.0
BK-1286 Cover manager filter is not working correctly

Problem was with the jQuery selector used in the backbone model for the
filter
BK-1289 Book metadata in the editing interface
BK-1285 Tooltips for covers are not visible
Merge branch 'BK1289' into 2.0
Merge branch 'BK1285' into 2.0
BK-1296 Implement Editing roles in the Book settings interface
BK-795 Aloha plugin for Search & Replace functionality
BK-1304 Implement security checks now that we have Roles in editor
BK-1305 Add 'view all books' link to the front page
BK-1306 Some of the panels in the editor are not scrollable
BK-1301 Unicode warning on book export from command line
BK-1201 Switch of language used in the interface
Merge branch 'BK-1301' into 2.0
BK-1308 bookload management command has some debug output
BK-1309 Implement Zen mode in the editor
BK-1310 Nothing shows up for the empty route in the editor