Fixed resource leaks.
Created utility method to close Closeables quietly.
Remove Handler usage from AndroidAsync.

This belongs in a higher level library, like ion.

Change-Id: Ide95cc25db257819eda1d93fb8892c21158026db
Update README.md
Merge pull request #91 from hborders/resource_leaks

Fixed resource leaks.
Change HashList behavior.

Do not automatically remove the entry/tag if the last item is removed.

Change-Id: I5c8fe8ccc51cb6e3ae0a49ceb1f80fa0dbe0cb6c
Merge remote-tracking branch 'koush/master' into cm-11.0
Fixups for Handler removal.
Merge branch 'master' of https://github.com/koush/AndroidAsync

# By Koushik Dutta (4) and Heath Borders (2)
# Via Koushik Dutta
* 'master' of https://github.com/koush/AndroidAsync:
  Fixups for Handler removal.
  Change HashList behavior.
  Update README.md
  Remove Handler usage from AndroidAsync.
  Created utility method to close Closeables quietly.
  Fixed resource leaks.