Use the system proxy when it's defined.
The default HttpUrlConnection does that, as well as okhttp.
This should only work on API v12 and above. Before that the system proxy had to be caught manually by the UrlConnection user.
goddamn gradle publishing
ffs
ffs
remove file
Merge branch 'use_android_proxy' of git://github.com/robUx4/AndroidAsync into robUx4-use_android_proxy

Conflicts:
	AndroidAsync/src/com/koushikdutta/async/http/AsyncHttpRequest.java
Refactor proxy implementation. Maybe this should go into ion?

Though HttpUrlConnection behaves the same way, uses proxy automatically.
AsyncSSLSocketWrapper: Perform handshake before allowing read/write.
Merge branch 'master' of https://github.com/koush/AndroidAsync

# By Koushik Dutta (6) and Steve Lhomme (1)
# Via Koushik Dutta
* 'master' of https://github.com/koush/AndroidAsync:
  AsyncSSLSocketWrapper: Perform handshake before allowing read/write.
  Refactor proxy implementation. Maybe this should go into ion?
  remove file
  ffs
  ffs
  goddamn gradle publishing
  Use the system proxy when it's defined. The default HttpUrlConnection does that, as well as okhttp. This should only work on API v12 and above. Before that the system proxy had to be caught manually by the UrlConnection user.