Add default Gemfile

Generated by running `bundle init`

Signed-off-by: Johnneylee Jack Rollins <Johnneylee.Rollins@gmail.com>
Generating application using rails 4.0.2 and ruby 2.1.0p0

The application was generated using:
`bundle exec rails new blog --skip-active-record --skip-test-unit`

Signed-off-by: Johnneylee Jack Rollins <Johnneylee.Rollins@gmail.com>