[Bf-webcontent] site optimizations and speeding it up

[Daniel Schalla]

I created a fork with minified versions of the slider images and also 
combined the current used JS, the others are not included, so I didn't 
combined them into libs.js

I will combine this evening the CSS Files probally, unsure there because 
we are still in the development phase.
Shall I maybe create a PHP Script which does that and acts as CSS File? 
So the Server does the work,
we could use there also caching. So we keep the seperation for us, but 
the user gets a combined version.