3.0/interface approvements

This includes:

* New toolbar style
* New insert element button

See commit messages ee03a250f58a91f7ae9f399093337f2ea4643313 and 66a5c4059cdf95cbac880478ea001ca82e248ff8 for detailed explanation.

Here is a screenshot:

![alchemy cms - new interface](https://cloud.githubusercontent.com/assets/42868/2970607/db62036e-db5d-11e3-906e-ad482617b5f7.jpg)

And a video:

http://quick.as/7ahago