Merge remote-tracking branch 'origin/master'

Conflicts:
	src/com/androidquery/callback/AbstractAjaxCallback.java
Fix issues gzip where headers are null.
Fix potential null pointer issue caused by racing condition when stop
process is not called with UI thread.
Add min sdk tag.
Add gzipped error response handling for code != 2xx.
Added round corner image support.
Log facebook error regardless of debug setting.
Pass along the fb error message to status.getError
Add javadoc.
Merge branch 'dev' of github.com:androidquery/androidquery into dev
Fix mem cache issue with downsampled and round corner images.
Handle image variants caching case.
Fix gzip response for multipart post.
Fix prematurely closed streams for synchronous call.
Add status code javadoc.
Added warnings.
Add subdomain with underscore test case.
Organize imports.
Ajax and image now support absolute file path as an url.
Fixed typo.