Trello, bit.ly, yesterday, argparse and more...

• New plugins supported: Trello, bit.ly, idonethis
• Support 'did yesterday' for yesterday's updates
• Ignore comment updates without author specified
• User does not have to be assignee to close a bug
• Create vim tags using the 'make tags' target
• Use option prefix also for git, header and footer
• Extend the test coverage for cli, base and utils
• Rename DID_CONFIG to DID_DIR to match the content
• Improve error handling, especially config errors
• Migrate option parsing from optparse to argparse
• Configurable support for showing bug resolutions
• Support --conf as abbreviation for --config
• Initial set of tests for the trac plugin
• Improve readability of gerrit by using review number
• Improve closed bugs stats, add test case [fix #45]
• Add statistics of closed bugs for bugzilla plugin