Adds support for more jpeg extensions

in relation to https://github.com/asciidisco/grunt-imagine/issues/30
Finish jpe
Added npm phantomjs for easier redistribution
Create output directories if they don't exist (required for Windows)
Added the SCSS output option
Fixed bug that prevents running multiple sprite targets
Added SASS support
Added the LESS output functionality
Added the sass and less example tasks
Merge pull request #32 from LaurentGoderre/scss-support

Implements SCSS support
Fix #34 by making the image path relative to the css path
Converted the image input from command line argument to stdin input

This change allows working around the limitted since a spawned command has. (See #33)
Merge pull request #35 from LaurentGoderre/fix-34

Fix #34 by making the image path relative to the css path
Merge pull request #36 from LaurentGoderre/fix-33

Converted the image input from command line argument to stdin input
Version bump @v0.3.1
Finish v0.3.1
+ Added SCSS, SASS, LESS output option to sprites task [Thx to @LaurentGoderre] (https://github.com/LaurentGoderre)
  - e1699cc2 Converted the image input from command line argument to stdin input [@LaurentGoderre]
  - 6802570c Fix #34 by making the image path relative to the css path [@LaurentGoderre]
  - 526fe343 Added the sass and less example tasks [@LaurentGoderre]
  - 0cf20e7e Added the LESS output functionality [@LaurentGoderre]
  - 9ea3e851 Added SASS support [@LaurentGoderre]
  - a6afbe47 Fixed bug that prevents running multiple sprite targets [@LaurentGoderre]
  - f9d6924e Added the SCSS output option [@LaurentGoderre]
  - 61655844 Create output directories if they don't exist (required for Windows) [@LaurentGoderre]
  - d1c8fbc7 Added npm phantomjs for easier redistribution [@LaurentGoderre]
Fixed the sprites background offset being output in reverse

See #27
Merge pull request #38 from LaurentGoderre/fix-37

Fixed the sprites background offset being output in reverse
Added the SCSS support documentation
Merge pull request #41 from LaurentGoderre/update-readme

Added the SCSS support documentation to the readme