Merge pull request #70 from rwz/master

Default options handling
add GitHub Flavored Markdown to README

* This makes the example code easier to read,
  especially when perusing the docs on github
Merge pull request #72 from phlipper/patch-1

add GitHub Flavored Markdown to README
Use JSON.generate instead of #to_json

Closes #73.
Add Gem Version badge
Move development dependencies into Gemfile