Add theme info to package.json

By adding this information we can now select the theme from Ghost admin
panel. It follows the format of the Casper package.json file.
Add initial tags to default.hbs

The initial tags include the head and body tag. Essentially it will set
up the file for future changes. The ghost head and ghost foot tags are
placed in their appropriate location and are essential tags according to
Ghost.
Add a git ignore file to repo

The git ignore file ignores the .swp files that VIM produces when
accessing files. These files are unnecessary to the project and should
only be seen by the local machine anyway.