Update github.js

fix typo
Fix single line comments in executeHandler
chore(grunt): add .js files from tests/ to linting
style(jshint): satisfy 'W033: Missing semicolon'
style(jshint): satisfy 'W109: Strings must use singlequote.'
style(jshint): satisfy 'W117: var is not defined.'
Merge pull request #203 from chriswininger/master

Fix single line comments in executeHandler
Merge pull request #200 from schenker/master

Fixed typo in github.js demo test
Merge pull request #206 from davidlinse/update-linted-files

Update linted files and fix some jshint issues
exposed desiredCapabilities on the client api to satisfy #202