Create Guides

In the vain of doing smaller updates, here's an implementation of the create guide page that:

# What's changed
* Guides now have practices
* Practices can be chosen on guide creation (yet to be implemented on guide editing)
* Design of the new guide flow
![screenshot 2014-11-17 15 42 08](https://cloud.githubusercontent.com/assets/485583/5067064/52ed5410-6e70-11e4-9726-25e114b3813a.png)

# What's next
* I need to have a look at the upload image directive to see how this will fit into all of this
* The next step (possible stages).