[MERGE] Add a --revision option to 'bzr push'

[John Arbash Meinel]

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Daniel Mark Watkins wrote:
| Hey all,
|
| There was a point during the sprint where I wanted to push up to a
| particular revision to Launchpad.  To do this, I had to locally branch
| up to the revision wanted and then push from that branch.
|
| This patch adds a --revision option to 'bzr push' which solves that use
| case.
|
|
| Dan
|

BB:approve

John
=:->

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