Remove GitHub’s default styles

 * Remove some `html` and `body` styles which are only applicable to GitHub
 * Replace `html` and `body` selectors with `.markdown-body`
 * Prefix all other selectors with `.markdown-body`

Closes #1.
Merge pull request #3 from d10/gh-pages

Remove GitHub’s default styles
remove the rule if there are no declarations
add generate script to package.json
bump stylesheet from github.com changes
merge duplicate `.markdown-body` rules
bump deps and refactor code
0.2.0
README: fix typo

replace closing `<div>` by closing `<article>`
Merge pull request #4 from proppy/patch-1

README: fix typo
generate the new GitHub readme style

https://twitter.com/mdo/status/496475496457072640

I just ran `npm run generate`. Yay programming.
1.0.0
don't need to write to disk anymore

UnCSS now accepts an HTML string as input
regenerate github css
1.0.1
Update index.html
regenerate github css

fixes #5
1.0.2