Added support for verifying that external pull request branches match
the feature branch naming convention including linking to a valid issue
number in the main repo.  If the name does not match, mrbelvedere posts
a comment providing the issue with the branch name and automatically
closes the pull request
Bug fix in closing of pull requests when branch name doesn't match
feature branch naming convention
Prevent double comments when processing pull requests with an invalid
branch name format.  Also, track the state and skip closed pull requests