Sample sponsor setup
Remove reference to code in Gemfile

removed the source 'http://download.bioinformatics.northwestern.edu/gems'
and ran bundle update to ensure that all the gems can be retrieved from
https://rubygems.org or http://github.com/

Also added a database.yml.example file for those who are more familiar with
this type of Ruby on Rails setup (esp. new users adopting nucats_assist)
Merge branch 'develop'