put db/schema.rb under version control.
only copy `database.yml` if it does not exist.
load the schema before `db:test:load`.

This prevents the following error:

/Users/senny/Projects/rails-contributors/db/schema.rb doesn't exist yet. Run `rake db:migrate` to create it then try again. If you do not intend to use a database, you should instead alter /Users/senny/Projects/rails-contributors/config/application.rb to limit the frameworks that will be loaded
extract lead color into scss variable.
remove nested method definitions to prevent test warning.

This prevents the following warning:

* CommitsControllerTest#test_in_edgetest/unit warning: method CommitsControllerTest#test_index_for_contributors is redefined
Merge pull request #22 from senny/setup_fixes

First steps to make it configurable for other projects