respect proxy settings across redirects

Change-Id: I3c5be049781665fcdf3b6e16c0b7cdec4445d877
Merge branch 'master' of https://github.com/koush/AndroidAsync

# By Koushik Dutta
# Via Koushik Dutta
* 'master' of https://github.com/koush/AndroidAsync:
  respect proxy settings across redirects