Changes to enable ChorusHub to work on Linux

- Uses smaller icon; 256x256 version fails on Mono
- Advertiser sets EnableBroadcast on UdpClient
- GetRepositoryInformation is marshaled as a string rather than enumeration

For it to work also requires running with mono 2.10.10 or later,
or an earlier version with the patch described at
https://bugzilla.xamarin.com/show_bug.cgi?id=275
Don't set thread pool thread name (does not work on current Mono)
Repair the botched merge in the previous commit
Bump chorus hub version number

(for change making GetRepositoryInformation return a single string
instead of enumeration...should have been done as part of fd3fcc298e49)
Merge ChorusHubWork (and various ancestors) into WeSay1.4

These changes are needed to make WeSay work properly with ChorusHub.
Add L10NSharp to ChorusMergeModule
Adding .gitattributes and .gitignore files

This is in preparation for the migration to git.