add ruby version gemset
add pull_request #check_state method for updating state and issue comments count #126;
add comments_count coulmn to pull_requests table;
add rake task for updating old pull_requests records;
remove trailing spaces;
add mock_issue spec helper method.
remove unneeded comma
add .ruby-gemset to .gitignore
Merge pull request #302 from dpsk/pull-request-status-and-comment-counts

Pull request status and comment counts
Gem updates