Fix spelling of "GitHub"

[ci skip]
Merge pull request #138 from splattael/fix-spelling

Fix spelling of "GitHub"
Add PogoScript support
Add Code Climate badge to README
Update README.md

Replaced the function that does not exist in the readme with a piece of code that implements the same functionality. This should give people a easier start with cucumber.js because the Readme.md has more contents that can be tried by copy and paste
Add listener and event handler registration (close #130)

This introduces registerListener and registerEventHandler to the support
code helper. Those two methods let clients register custom listeners for
AST events.

Relates to #91.
Typo
Release 0.3.2
Bump CoffeeScript
Bump connect
Bump cucumber-html
Bump gherkin
Bump jasmine-node
Bump mkdirp
Bump nopt
Bump pogo
Bump rimraf
Bump underscore
Bump walkdir
Add durations to JsonFormatter (close #125 #139)