update to support Underscore 1.4.3

also updated Knockout JS to 2.2.0
cleaned up changes -  only mutators need an underscore appended
Merge pull request #5 from enzoaeneas/master

update for Underscore 1.4.3
Build file
[Closes #4] Added working build file, updated to _ 1.4.3, organized project a bit
Added sublime text project
Switched to grunt.js to build, fixes #6
Updated contrib guidelines
Create CONTRIBUTING.md
Update readme.md
Update CONTRIBUTING.md
Update readme.md
Update CONTRIBUTING.md