[WIP] menu improvements

- [ ] fix context menu with dark theme
- [ ] improve menu / context menu style, the current is ugly

maybe this is better...

![image](https://f.cloud.github.com/assets/658431/1416603/1e1323bc-3f5c-11e3-8873-5dac5118b85d.png)
![image](https://f.cloud.github.com/assets/658431/1416605/201685e6-3f5c-11e3-9b0a-f75e30f68799.png)

Closes #745 
Apart of #744