Put the contribution guide into CONTRIBUTING.md
Replaced find_all_by through find_by
Find_by_all is removed in Rails 4.1
Installs 'formtastic', '~> 2.3.0.rc3' to fix issues with Rails 4
Merge pull request #73 from hennevogel/master

Put the contribution guide into CONTRIBUTING.md
dropped first()
Merge pull request #78 from ChrisBr/fix_rails4_issues

Fix rails4 issues
Add support for guard and spring

guard encourages TDD behaviour through development iterations which
include continuous testing.

Coupling this with spring eliminates the cost of continually loading
gems into a fresh environment every time the tests are run.