* stable-2.8:
Update release notes with recently made changes
Buck: extend the tool chain to support unsigning JARs
Update jgit to 3.1.0.201310021548-r
Fixing jdbc code: correct Statement closing
Remove unnecessary imports
Print error message to log when plugin loader fails to close JAR file
Document how plugins can listen to stream-events
Change-Id: I2f0051fdf065a6b0170294c6f9dfbef1ea4018ab
f95b641a74