Merge pull request #95 from btaitelb/fix_rspec

fixes failing rspec tests and adds factory_girl
Migrate EIN to string, add comment regarding API keys
Merge branch 'master' of github.com:giv2giv/giv2giv-rails
Appropriate naming for sessions.donor_id
naming update
fixing up endowment show and tests
fixing up divide by zero
Fixing up response from index
create style mismatch
Trying to fix up endowment posting params and tests.
endowment visibility
fixes endowment controller spec