enhc Text styles for nav and global var setup

Setup a global variables file and type style file to setup the styling
for the navigation.

Using a stand-in font for now until setup typography.com account.
Fixed naming of things unused code
Removed unused file
enhc Add full width, featured background image

This is a "featured" project image that spans from top of the page
til the next section.

Uses a new background image class and user applies a background url
along with a height inline.

Not 100% confident in my choice to use z-indexing on this solution, but
am also not 100% sure on how this bg image and other will be used
across the site.

Other changes:
- Setup z-index variables to avoid collisions.
Added helpful instructions comment
Merge pull request #44 from msecret/enhance-global_styles_setup

Enhance global styles setup
changing icon field on issues to a foreignkey to media for image re-use.
merge
updated test fixture for new field.
swapping out featured issue in test fixture.
enhc Add full width, featured background image

This is a "featured" project image that spans from top of the page
til the next section.

Uses a new background image class and user applies a background url
along with a height inline.

Not 100% confident in my choice to use z-indexing on this solution, but
am also not 100% sure on how this bg image and other will be used
across the site.

Other changes:
- Setup z-index variables to avoid collisions.
Merge branch 'enhc-full_bg_featured_img' of github.com:msecret/peacecorps-site into enhc-full_bg_featured_img
Merge pull request #45 from annalee/iconfield

Updating icon field on issue model
including the issue featured image in the issue template.
Merge pull request #47 from annalee/issuetemplate

including the issue featured image in the issue template.
Script to synchronize payments with a CSV
Merge pull request #46 from msecret/enhc-full_bg_featured_img

Enhc full bg featured img
Move test file
ench The featured project info and callout

This is the large, orange callout for the featured project. It uses
a full width banner component along with the showcase component to
display itself as an orange banner with the content and callout button
centered.

Have not worked on button yet or spacing below this element.
Modfied HTML to be slightly more semantic

Still don't know what I want to do about that div for the full_bg.