The "Scroll To Top"-button of CBA now scrolls smoothly to the top of the page

This commit implements the following feature:

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After implementing CSS3-Buttons, I cleaned up CSS and application.html.erb a bit.

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Felix found a nice solution for CSS3-buttons and we've implemented this awesome buttons by red-team in CBA.

New in CBA - Simple Layout for Page and PageComponent

User-views and invitation-view switched to HAML