Merge pull request #4 from cbodin/dev

Push to master
Merge pull request #5 from cbodin/dev

pr for v0.1.4
First version of the FileSystem class (untested).
ImageStyle: Updated to use FileSystem methods
ResourceCache: Updated to use FileSystem methods
Sass: Updated to use FileSystem methods
ImageStyle: Changed permissions to 0666
ImageStyle, ResourceCache, Sass. Changed permissions to 777 on generated files
Merge pull request #6 from cbodin/class-file

Merge Class file
Merge pull request #7 from cbodin/master

pull from master