Used backported Base64 implementation, and enhanced speed in escape() method.
Fixed a misaligned method call.
Fixed a small bug where BUILDER is used in escape() before being instantiated.
Fixed a bug when sending streams; meta data wasn't separated by commas.
There's no need to escape slash character since content is already base64-encoded.
Merge pull request #387 from orientalsensation/JsonStreamerPreFroyo

Used backported Base64 implementation, and enhanced speed in escape() method.