Set up RSpec test framework

- Add rspec-rails to the development/test group
- Generate RSpec config (.rspec, spec_helper, rails_helper)
- Add home page request spec as a smoke test
- Stop ignoring .rspec so test config is tracked

.gitignore

@@ -59,7 +59,6 @@ build-iPhoneSimulator/
 # ---> Rails
 *.rbc
 capybara-*.html
-.rspec
 /db/*.sqlite3
 /db/*.sqlite3-journal
 /db/*.sqlite3-[0-9]*