Display annotated "blame" version of a file

[GoogleCodeExporter]

Annotate the lines of a file with the revision they came from using the blame 
algorithm.

JGit blame is not identical to git-core's blame algorithm. Its a close 
approximation, but there are some differences in how JGit tracks the scoreboard 
and what annotations it can find.

Use /+blame/revision/path as the URL.

Because annotation is slow, results might want to be cached, and the page might 
want to use AJAX to feed down hunks of blame as they are discovered by the 
algorithm. This would be like the incremental blame display visible in git 
gui's blame window.

Original issue reported on code.google.com by dborowitz@google.com on 11 Nov 2012 at 11:25