Changes to make it work on Android SDK level 10 (Gingerbread)

Android lacks various APIs, and trying to pull in the Apache HTTP libs is problematic. This uses only APIs available to Android SDK level 10 (Gingerbread / 2.3.3).

The removal of the use of ThreadSafeClientConnManager is problematic, but it works for now. The fix should be easy but I didn't need it for my application.