Close #337. Update seeds, link frontend to API

# What's changed

*Linked the Front End guide creation and editing stuff to the API for stage actions. This revealed some problems with how images and actions were handled (never were) so there's some changes in the controller that take that into account.

![screenshot 2014-12-31 08 59 08](https://cloud.githubusercontent.com/assets/485583/5584807/5648d95e-90cb-11e4-9fc3-26bd435fcf38.png)
![screenshot 2014-12-31 08 59 55](https://cloud.githubusercontent.com/assets/485583/5584813/6c6756a2-90cb-11e4-815d-9edc363847f1.png)

# What's next.
* Add timeline input field.