chore(release): v0.2.3

Updated angular-facebook.js

Wrapped fbAsyncInit stuff in $timeout for sake of things being called on
same time.

Updated angular-facebook.js

Now, function passed to Facebook service methods through arguments is
not expected to be the last argument neccesarily, instead, it is
replaced in the same position it was passed.

This is needed in some cases like for the login method, which
accordingly to the Facebook API documentation, you can optionally pass
an object as last argument with extra options.

added basic tests and applied code conventions

Updated angular-facebook.js

Added Provider options get and set methods for new api init options:
authResponse, frictionlessRequests, hideFlashCallback.

Added Provider setInitCustomOption to set arbitrary init options as
desired.

Added getInitOption to retrieve init options as needed.

Update README.md

Merge pull request luiscarlosjayk#5 from mrzmyr/add-bower-support

add bower support