New design

Closes #88 
While its not perfect, I'm now confident to have a stable and good looking new design of the studentenportal.
Nearly all of the templates and all styles have changed but there is no additional functionality that has not already been merged into master. I only want to add new  features or modify existing features, once we switched to the new design.

I want to release the new design, so that I can gather some input and improve it, I don't want to spend more effort for things that people perhaps don't even like. There are still some open points (like I want it to use the whole page width, better forms and improve html semantics) but I can release these improvements later.

Because this is so huge I don't expect you to review all of the boring html and sass but instead look at the visuals and give feedback.
In order to get the full dataset, I recommend running `fetch_modules --update` and `fetch_classlist` to get all the lecturers. On my local machine I've imported the whole production dataset for testing. I will now work on adding better thumbnail (instead of simply running `imagemagick`) .

**Some screenshots:**

Home:
![home](https://cloud.githubusercontent.com/assets/1288339/2808401/5f87e69c-cd29-11e3-9759-e29d451ba498.png)

Document Categories:
![document_categories](https://cloud.githubusercontent.com/assets/1288339/2808402/62dd701e-cd29-11e3-8e2d-b9228437bace.png)

Documents
![documents](https://cloud.githubusercontent.com/assets/1288339/2808403/6535b010-cd29-11e3-9818-452b9d0a4f9f.png)

Lecturers
![lecturers](https://cloud.githubusercontent.com/assets/1288339/2808404/673ac3be-cd29-11e3-9d1f-64c4806d6eb4.png)

Lecturer Detail
![lecturer_detail](https://cloud.githubusercontent.com/assets/1288339/2808405/6967c006-cd29-11e3-9108-b58fa36e9a84.png)

Quotes
![quotes](https://cloud.githubusercontent.com/assets/1288339/2808406/6b6f482e-cd29-11e3-907a-5d20cbffae03.png)

Events
![events](https://cloud.githubusercontent.com/assets/1288339/2808407/6ff40eac-cd29-11e3-9204-62faddd47268.png)

Add Document
![add_document](https://cloud.githubusercontent.com/assets/1288339/2808408/72bae8f4-cd29-11e3-81ba-62b0d9e0762b.png)

Add Quote
![add_quote](https://cloud.githubusercontent.com/assets/1288339/2808409/74ed963a-cd29-11e3-9374-a72902534aa5.png)