Add main element to bower.json
It's very helpful with tools like Brunch, and others, to have a main entry point defined.
People can easily override this if they prefer another flavor, such as amd, etc.
Fix testem config
Fix Unit tests

Fixes: #29
Merge pull request #41 from blimmer/add-main-to-bower-json

Add main element to bower.json
Merge branch 'master' of https://github.com/indexiatech/ember-forms