Add application/x-targz to the set of valid content types
Merge pull request #490 from opscode/application-x-targz-content-type

Add application/x-targz to the set of valid content types
Override Foundation alert border colors.

This overrides the Foundation alert border colors to be the same as the alert
background colors. This creates a more consistent UI within Supermarket.
Merge pull request #492 from opscode/alert-borders

Override Foundation alert border colors.
Add closing p tags to Manage Profile > Agreements.
Create the contribute sidebar and styles.

When viewing the contribute tables, display a sidebar with the list of repos
that Supermarket watches aka Chef's open source projects, and if the user is
signed in, display user-specific information about their agreeemnts.
[wip] Create the Become a Contributor page

This re-organizes the file structure of where the contribute/sidebar is located,
while creating the route, controller action and spec for the page to point
people to in order to understand what it means to become a contributor.

The content is not ready, but the framework is there.
[wip] Create the All Signers table in Contribute.

This lists and displays all of the folks who have signed either an ICLA or CCLA.
This also changed the menu nav to Contributors instead of Contribute.
This also implements User.all_cla_signers, which is not complete at this time.

todo:

- improve the User.all_cla_signers method
- improve the all signers table by listing date of signature and adding
  denotation for those who are CCLA signers or ICLA signers or both