Update btsync ver. to 1.4.72

**Attention:** The binaries are currently not available under http://syncapp.bittorrent.com/1.4.72/, like in the previous version (http://syncapp.bittorrent.com/1.3.109/). You can only get them from here http://www.bittorrent.com/intl/de/sync/download and the download doesn't have a version number.
So I hosted the binaries on my server and renamed them, to fit the old naming style, here you can find them: http://www.andreasgiemza.de/btsync-for-synocommunity/1.4.72/
The problem is already mentioned in the BitTorrent Sync forum: http://forum.bittorrent.com/topic/31270-recommended-download-link-for-linux-packagers/
I would change that back when better downloads are available.

Is that ok?


**Change log:**
- New simplified UI
- HTTPS links support
- Proxy server support added
- Finder / Explorer integration added
- Moved folders support
- Sync performance optimization
- Numerous bug fixes found by users in 1.3

Full change log: http://forum.bittorrent.com/topic/31284-latest-desktop-build-1472/

**Info:**
Tested on my Synology 210j and Synology 413j. **All is working, nothing was lost after update! Updated from version 1.3.109.**