Refactor integration user specs

- Creates specs for pagination and search that was missing.
- Organize the mockjax JSON as fixturess
Some refactor on sessions integration spec
Update ember-simgple-auth to 0.6.4
Show bs-notification only on sessionsNew
Add ember-simple-testing and helpers
Solve random problem on testing because of bs notifications
Change sessions sign out spec because it reloads the page
Stub user url when authenticates
Create integration tests for projects
Create integration tests for contributions
Create integration tests for tags
Merge pull request #62 from neighborly/jl-improve-tests

Improve test suite by refactoring it and creating new tests