Refactor project model tests to use shoulda matchers.
* add require shoulda/matchers to rails_helper.
Refactor user model tests to use shoulda matchers.
* removed unnecessary require shoulda/matchers from rails helper.
Merge pull request #65 from tiger-swallowtails-2014/ES_shoulda_matchers_model_specs

Es shoulda matchers model specs
MM: Be-you-tee-full!! :)