Rename setJsonObjectBody to setJsonPojoBody.

Lots of people were passing in strange things... like String, JSONObject, etc.

Conflicts:
	ion/test/src/com/koushikdutta/ion/test/GsonTests.java
Merge branch 'master' into spdy
Test for issue 329.

Fixed with:
https://github.com/koush/AndroidAsync/commit/00d1f567597af6e141c6788da281e32962103570