Add test framework

[Issue #2]

Rspec for test, and Guard::Spork for automatically test.
add developing flow, close #6
add postgresql for heroku, #5
Merge branch 'release/heroku'

* release/heroku:
  add postgresql for heroku, #5
  add developing flow, close #6
  Add test framework
generate scaffold Idea, #7
modify root route, close #7
Merge branch 'release/heroku_first_show'

* release/heroku_first_show:
  modify root route, close #7
  generate scaffold Idea, #7