[JUX] Rearranged item edit views in admin

This PR rearranged some of the edit views according to the new 'JUX standards' and covers these views:
- Article
- Category
- Module
- Plugin

### Testing instructions
Test those (and other) edit views to see if nothing breaks and options are saved ok.

### Screenshots

#### Article
![a](https://f.cloud.github.com/assets/744259/1060937/c5155d72-11be-11e3-8f7c-9491c607d5df.png)


#### Category
![c](https://f.cloud.github.com/assets/744259/1060941/cf324b80-11be-11e3-9f78-11b43a42793b.png)


#### Module
![m](https://f.cloud.github.com/assets/744259/1060943/d45fe608-11be-11e3-8a17-f7701a4350de.png)


#### Custom HTML Module
![mc](https://f.cloud.github.com/assets/744259/1060944/d98d8cfc-11be-11e3-8789-c4c0704ebcc0.png)


#### Plugin
![p](https://f.cloud.github.com/assets/744259/1060946/de227f84-11be-11e3-8eb7-7e9b45b66df2.png)