reordered Gemfile
added github_api module
first draft of exporter
added 'Open Sans' font
second draft of exporter

added exporter work folder to gitignore
added .DS_Store to gitignore
second version of exporter with Git/Haml/Sass
added git as requirement in docs
added admin interface and new model github_contribution
Merge branch 'dev'

Conflicts:
	Gemfile.lock