Optional websocket user agent header support.
FileCallback onProgress >2GiB file support
Changed content length to be a long
Fix Classpath to line up with original
Merge pull request #154 from sst8696/master

Support files larger than 2GiB onProgress callback
Improve exception trace in SSL errors.
Merge branch 'master' of https://github.com/koush/AndroidAsync

# By sst8696 (3) and Koushik Dutta (2)
# Via Koushik Dutta
* 'master' of https://github.com/koush/AndroidAsync:
  Improve exception trace in SSL errors.
  Fix Classpath to line up with original
  Changed content length to be a long
  FileCallback onProgress >2GiB file support
  Optional websocket user agent header support.