Add lock files to .gitignore. 

Solr generates lock files when it's running. Adding *.lck files
to .gitignore will ensure that these aren't saved to the repo.
Remove repo addition from README.

Running `heroku apps:create myapp` automatically creates a 'heroku'
remote repository. You can just commit changes to the code base, and
then attempt a push to heroku.
Add instruction for setting DATABASE_URL.

When running through the instructions, I couldn't override Postgres
being used within Heroku unless I set DATABASE_URL by hand, and
ensured the pg gem was installed.
Moved the pg gem into Gemfile.  Moved the db config up with rds activation in README:
Bumped to rc4
Adding spot in em.yml for user agreement
Adding GPLv3 LICENSE
Merge branch 'master' of github.com:fracturedatlas/artfully_app
Removing migration
Updating README
Delete gemfile lock
Removing pg and adding lock to gitignore
Don't ignore gemerated schemas
Taking lock out of gitignore
Moved sqlite into development
Adding SendGrid to README.  Adding smtp config to prod.rb
Add links for dependencies
Merge pull request #1 from briandfoy/master

Link for dependency projects
Add in Unicorn and Unicorn Killer in place of Thin as the server for rack
Gemfile.lock