Added invert method
Added compare/compareTo
Simplified Gruntfile.js
Create README.md
Cleaning coverage folder and .min.js before build
Update README.md
Fixed getCommonNumerator overflow
Improved comparison algorithm
Underscored names for reserved properties
Added function sign
Fixed test case descriptions ('=' → '≠')
npm release
Optimized minification
Merge remote-tracking branch 'upstream/master'