added tmp to .gitignore
added pull requests and updated migrations
added gems required for github interaction
pull requests can now parse branch names
new migrations for pull requests
WORKS! Crude rendering of repo's closed pull requests

Much left to do:

* report doesn't support any options (yet)
* layout is Crude
* need to add attributes to PullRequest (assignee, comments url, etc)
* need to hook in contributer data and generate Contributor objects
repo display works well, removed pull requests table
minor UI improvements
updated project creation to include repo
pull requests now use project limiting

If a one or more projects have been specified for the
current repo then pull request projects will be limited
to names that match those of projects associated with the repo
minor UI improvement to home page