allow each user to specify their rspec config
added guard for tdd, configured to use the gaurd-rspec gem and spring (ensure the spring binstubs are installed). 

to run use: bundle exec gaurd --no-interactions, see docs for more info
Merge branch 'tdd_setup'
Update rspec to newest release
Merge pull request #20 from zooniverse/feature-updated_rspec

Update rspec to newest release