Updated .gitignore
Removed unnecessary vendor prefixes (see autoprefixer)
Added build script
Updated README.md with installation instructions
Moved csslint task in the build task
Updated README.md with test task instructions
Added a line feed at the bottom of the file
Updated README
Fixed undefined 'csslint' task in 'watch' task
Added explanations on how to launch Gulp tasks
Translated the README file
Fixed some typos
Added .travis.yml
Updated csslint to accept adjoined CSS classes
Added buttons
Simplified the CSS needed to disable a button
Added support for the :focus state
Removed :focus CSS code as it wasn't needed
Added Open Sans font
Some font related adjustments