Merge branch 'release/0.2.0'

* release/0.2.0:
  Added basic spriting impl. & docs
  Added some spriting stuff (very basic at the moment)
  Created sprite engine branch
  Added phantomjs spriter batch file
  Added sprite skelton file
Version bump
Fixed linting issue
Fixed typo
Tells optipng not to replace the inputFile but write it to outputFile
Merge pull request #4 from butfriendly/master

optipng replaced input files although a destination was given
Fix for image compressing on windows

PathSeparator like in sprites task, closes #6.
Merge pull request #7 from i-akhmadullin/patch-1

Fix for image compressing on windows.
Updating image inlining task to use node mime type detection.
Added mime-type detection for HTML as well as CSS, fixed small bug in which affected images were not being counted
Merge pull request #12 from dethtron5000/master

Mime type detection and small bug fixes
Fixed build task
Fixed build task
using async.js to control the flow of reading the images into memory, adding to package dependencies
Merge pull request #14 from dominicbarnes/sprites_fix

Fix for Sprite Generation
Version bump
Update README.md

Update references to Grunt.js repository as it has moved, and the new getting started link has a much fuller description.
Merge pull request #15 from calvinf/patch-1

Update README.md
Fixes for upgrade
Update tasks/helper.js