adds code_snippet text column to projects table
code snippets are not an attribute of the projects table.
master altered forms that are relavant to this functionality.

Merge branch 'master' of https://github.com/dmill/gitfolio into adding-code-snippets
developer show page now lets you add code snippets
adds prettify files, unedited. manual install. no prettify files changed.
prettify now loads in application.css, overriding foundation when conflicted, but overwritten by custom css when conflicted
merge required for contiuing to work on form

Merge branch 'master' of https://github.com/dmill/gitfolio into adding-code-snippets
Individual projects now render either as images or as code snippets.
adds correct pretty print class to project page
Merge pull request #35 from dmill/adding-code-snippets

Adding code snippets