Simplify paddings on .alert boxes
Clean up donate banner

* Rephrased donation plea
* Added Flattr
* Moved donate buttons into a single row
* Change donate buttons to a unified system
* Get rid of paypal's shitty encrypted <form>, replace with link
* Add a label and message to the bitcoin URL
Clean up virus scans banner

* use mdash to match donate banner
* Change indentation and bolding scheme to match donate banner
Make donate banner alert-info instead of alert-error