Version up to 1.5.2
Added seasonal icon for winter holidays
Updated hint in URL input field
Dumb update of Jelly Bean workaround app (just version up)
Merge pull request #324 from owncloud/last_minute_release-1.5.2

Last minute additions for release 1.5.2
Merge remote-tracking branch 'origin/release-1.5.2' into release-1.5.2
File with just one chunk use the old non-chunked interface, so that they work in all the servers under 6.0
Removed legacy icons in JB workaround app
Merge branch 'master' into develop