Add info to Manage Profile about updating account.

Let users know that they can update their email, password and name via their
Chef account. Add a link that goes to that page and let them know when it will
be updated on Supermarket.
Fix for Bash Install re: EOH
Merge pull request #291 from anthroprose/bash-install-fix

Fix for Bash Install re: EOH
Add link to InVision.
Merge pull request #293 from coderanger/patch-1

Add link to InVision.
Merge pull request #289 from opscode/manage_profile_information

Add info to Manage Profile about updating account.
Overhaul and update the UI.

- Remove the cookbook categories nav in the cookbooks directory. The category
  nav is of questionable value, so for the time being the nav is being removed.
- Use the actual cookbook category on the cookbook partial.
- Make the search bar global with new styles.
- Remove the temp stats from the cookbooks directory as they now live on the
  welcome page.
- Update the layout of the cookbook partial
- Update the global header styles
- Add support for the generic platform for cookbooks.

Notes:

Wrap submit_form feature helpers in within blocks to be more specific about the
submit button be pressed. This needs to happen because the search bar form as
been added, meaning there is always at least one form on every page.

The names displayed on the cookbook partial are generated from Faker. They need
to be properly displayed based upon the cookbook's owner once that is
implemented.
Merge pull request #295 from opscode/ui_updates

UI Updates
Use rake db:setup in the README for simplicity.

rake db:setup runs create, migrate and seed. One command is better than three!

This also encourages use of bundle exec rake for simplicity.
Merge pull request #297 from opscode/rake_db_setup

Use rake db:setup in the README for simplicity.
Add Sign Up button to the welcome page.
Flesh out the content on the welcome page. [WIP]

This is not done yet, and it is sure as heck not designed, but the goal is to
create a welcome page that is clean and useful. It should have a focus on what
Supermarket is, how to share cookbooks, how to use Chef and what is going on.