Add a better error message when using --revision-range on Perforce repository

Review Request #2614 — Created Sept. 24, 2011 and submitted — Latest diff uploaded

mike_conley
RBTools
1495
rbtools
When using post-review in a Perforce repository, if users included the --revision-range parameter, post-review would spin out with a confusing error message.

This patch displays something a little more useful, including a link to Review Board's documentation on Perforce's range path syntax.
Added a quick test to ensure that using --revision-range on a Perforce repository causes us to exit out.
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