UI revamp

Small schanges for a slightly more modern UI:
- Revamped profile lane.
- No tiles pattern on the borders any more.
- No holo-dark-gradient but a solid black for the black theme.

*This is just a suggestion. If you like it, take it, if you don't, I won't be sad.*

Screenshots (left old, right new):
- [profile, dark](http://i.imgur.com/q5lSGoS.png)
- [profile, light](http://i.imgur.com/XD9Pt0p.png)
- [timeline, dark](http://i.imgur.com/yXSMGpV.png)
- [timeline, light](http://i.imgur.com/GbR2RSC.png)