Add user interface for Bands, Tours and Shows

[tmaier]

This is the first step for views and controllers for echo.

This pull requests

• adds a few more gems to make development easier,
• fixes some bugs regarding the view,
• adds views and controller
  • Bands
  • Tours
  • Shows

I test most of the things with the request spec. I hope this is fine for you.
It's not about beauty. I just want to get the basics working to have a framework to test and prove bugs etc.

I'm happy to hear if this is fine for your and your comments and thoughts about this.

[durran]

Awesome thanks! I'm actually going to pick parts of this to bring in though, as I was starting to do the front-end in backbone.js - but there a few things I know off the top I wasn't going to use:

• inherited_resources (I think it's a bit too much magic, and the Rails pattern of copying instance variables from the controllers into the views is a bad practice. I'd be using decent_exposure instead in the controllers)
• database_cleaner (I don't think there's a need for the gem when a simple Mongoid.purge! in the rspec config for before hooks takes care of it.)

I'll have a chance to go through this more in the next week since I am slammed with work right now... But awesome pull request!