refs #13 Install rspec and factorygirl
refs #13 just exec rails g rspec:scaffold
refs #13 Refactor controller specs
refs #13 Delete unnecessary tests under 'test/'.
refs #13 Delete unnecessary code generated by scaffold because it dont use other format.
refs #13 Use FactoryGirl for spec.
refs #13 Add validations of expense amount and specs.
refs #13 Modify to allow negative value of amount.
Merge pull request #14 from upinetree/13_setup_specs

13 setup specs