Added more strength to the css to override site styles

Added more strength to the css to override site styles

Focus on:
-- buttons
-- tabs and widget block modal
-- added input prepend to forms

**Note: The widget/block modal styles are perceptible to site style overrides because this modal is in the site markup rather than the markup added to the end on the page. 

This test failed not sure if I caused this:

![screen shot 2013-08-08 at 2 02 05 pm](https://f.cloud.github.com/assets/726265/929358/a5558dc2-ffdf-11e2-8db6-24e7a3586ad9.png)