Added configuration for prose

As mentioned in #14, added configuration to prose to allow for an easier
interface when writing blog posts. Excluded unneeded files and folders, setup
a media folder, added the hidden blog field, and create a tags field where a
user could enter in multiple tags.

Could use more specs on what other UI this would
need to be successful.
Created blog section

This includes:
- Blog page with blog excerpts and links with all blog titles on right
- Specific blog page
- All configuration
Styled single blog page

This is a full width page with large text for the blog. Could also make it
have a sidebar.

Had to create a new header to deal with the different header format for the
blog post. Have to re-look at this.

TODO:
- Removed duplicated in header template.
- Possibly add an aside for the sidebar with other blog posts
Merge pull request #16 from msecret/gh-pages

Added configuration for prose