Add a "supports post commit" flag to SCMTool and HostingService.
Review Request #4314 — Created July 10, 2013 and submitted
Add a "supports post commit" flag to SCMTool and HostingService. This adds a flag that we can access to know when we're able to create post-commit reviews.

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This is a review from Review Bot. Tool: Pyflakes Processed Files: reviewboard/hostingsvcs/github.py reviewboard/scmtools/svn.py reviewboard/scmtools/models.py reviewboard/scmtools/core.py reviewboard/hostingsvcs/service.py Ignored Files:
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reviewboard/hostingsvcs/service.py (Diff revision 1) Mind making these alphabetical? The other supports_* here are alphabetical right now, so might as well.
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This is a review from Review Bot. Tool: PEP8 Style Checker Processed Files: reviewboard/hostingsvcs/github.py reviewboard/scmtools/svn.py reviewboard/scmtools/models.py reviewboard/scmtools/core.py reviewboard/hostingsvcs/service.py Ignored Files:
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This is a review from Review Bot. Tool: Pyflakes Processed Files: reviewboard/hostingsvcs/github.py reviewboard/scmtools/svn.py reviewboard/scmtools/models.py reviewboard/scmtools/core.py reviewboard/hostingsvcs/service.py Ignored Files:

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This is a review from Review Bot. Tool: PEP8 Style Checker Processed Files: reviewboard/hostingsvcs/github.py reviewboard/scmtools/svn.py reviewboard/scmtools/models.py reviewboard/scmtools/core.py reviewboard/hostingsvcs/service.py Ignored Files: