Create service factory for OAuth.
Config karma for running jasmine specs stored in the specs folder and
add initial Post model with a test.
Add js-yaml.
Introduce post model object with methods for converting to and from
Jekyll data and generating commit data for github.
Add method to set the menu tag of a post.
Editable post title and added select for menu tag.
A little bit of styling.
Generate empty jekyll data when post content is empty.
Change menu tag for post when changing the dropdown.
Remove menu tag when setting it to nothing.
Improve treatment of newlines after YAML front matter when converting to and from jekyll.