Let review and for_each_patchset review by REST

REST-based reviewing allows for finer granularity during review;
messages may be posted directly to the relevant lines on modified
files. Add support for this.
Suggest github for bug reports.
Added tests for REST-based reviewing
Add files to manifest
Fixed license "unknown" in metadata

LGPL_2 isn't a valid license spec; supposed to be lgpl_2_1.
Copyright and link updates.
Prepare release 20140609