Add Project model and automatically create projects

related to #24
Move BuildResult below Build
add Project in admin
fix small issues with new Project model #24
Move all github related code into helpers.github
Remove test of code that is removed
Add tests for Project model
Move start build to project model
fix generation of github url
Add github helper to generate pull request url
fix pep8
Fix templates, make them use project model
Move project creation
move github webhook to api modules
add views for organization and project
add smoke tests for views in builds app
add testing of parse-github-helpers
Overwrites push.json with data from tind/frigg
Adds pull_request.json and comment.json
Renames fixture tests for push.json