Added gitignore
Added support for local mode and excludes

- can now print graphviz code to stdout (to be then passed to dot)
- can now exclude specific link types
- replaced restkit with requests (had issues with query parameter encoding)
- replaced optparse with argparse (to collect multiple excludes)
- added support for epic links
- moved main code into own function to keep namespace clean
Merge pull request #3 from whiskeysierra/feature/local

Added support for local mode (stdout) and excluding links