Improved Error Notifications

Using [MessageBar][1] to improve the UI for error messages. Add the MessageBar module like you would any other.

![screenshot][2]

[1]:http://www.androidviews.net/2013/05/httpsimonvt-github-iomessagebar/
[2]:http://www.androidviews.net/wp-content/uploads/2013/05/template1.png
Merge pull request #146 from steffanc/better-toasts

Improved Error Notifications