The patch command now supports applying review requests with commit

history. If requested via command line arguments, each commit in the

review request will be applied in sequence on the current branch,

optionally committing each patch. The default behaviour is to replicate

what ever format of review request was uploaded, but this can be

overridden via flags.

Ran unit tests.
Manually tested the following against review requests with multiple

commits:

Ran rbt patch. The commits were not committed. The output of

git diff was correct.
Ran rbt patch -C. The commits were all created client side. The

output of git diff was correct.
Ran rbt patch -S. The commits were not committed. The output of

git diff was correct. Verified via the --debug flag that we only

request the condensed diff from the server.
Ran rbt patch -SC against a review request with multiple commits.

The resulting commit was of the old format (description, testing done,

bugs fixed, etc.).

Manually tested the following against review request without multiple

commits:

Ran rbt patch. No commits were created.  The output of git diff

was correct.
Ran rbt patch -C. One commit was created and it was of the old

format (as specified above). The output of git diff was correct.
Ran rbt patch -SC. Same behaviour of rbt patch -C.