Add LESS variables and properties to buttons
Add dist/ directory to .gitignore
Add a CONTRIBUTING.md file to lay down some rules because pull requests have been messy
version bump to 2.3.0; added bold font weight to buttons by default
added semicolons and build to dist directory (thanks @brandonb927)
added test.html file
tailored CONTRIBUTING.md instructions to cardinal
version bump to 2.3.0
updated README.md with more instructions on LESS / Grunt and the new CONTRIBUTING.md file