Implement AsyncHttpServerResponse.sendStream
AsyncHttpServerResponse: Handle HEAD requests.
Add support for content type setting in MultiPart
Add functions for getting the logging.

Change-Id: Ia12708f66e5ea7efb7ed889d0e924653f8d2fa44
Merge remote-tracking branch 'koush/master' into cm-11.0
Merge branch 'master' of https://github.com/koush/AndroidAsync

# By Koushik Dutta
# Via Koushik Dutta
* 'master' of https://github.com/koush/AndroidAsync:
  Add functions for getting the logging.
  Add support for content type setting in MultiPart
  AsyncHttpServerResponse: Handle HEAD requests.
  Implement AsyncHttpServerResponse.sendStream