Add pronto-scss runner to README
Add the new pronto-coffeelint runner to README

I quickly created a runner for coffeelint, which lints .coffee files (shamelessly copied and adapted from pronto-jshint). Add this to the README file
Merge pull request #41 from siebertm/patch-1

Add the new pronto-coffeelint runner to README
Analyze changes in git index using "-i" option

Add '--index' option for 'pronto run'.

After this commit you can run pronto on your current
staging area (git index).

This way pronto analyzes changes _before_ committing.

Usage:

    pronto run -i
Merge pull request #40 from splattael/git-index

Analyze changes in git index using "-i" option
Improve example of adding runners in README
Filters out duplicate offences for Github formatters

When the same exact message is repeated on the same line,
this change removes the duplicates.  The test was updated
to reflect this changed behavior as well.
Updated changelog with github duplicate comment change
Merge pull request #44 from edk/github_formatter_filter_duplicates

Filters out duplicate offences for Github formatters
Refactor Github to receive repo via constructor

Simplifies the whole class and moves the slug parsing to a more natural
place.