add brighten function
merge
add brighten to home page demo.  Issue #40
include alpha == 0 in check for rgba return, special case transparent name
expose getFormat() method
Ignores JetBrains PyCharm IDE files
Adds getBrightness, isLight, isDark and tests
Standardize test.js whitespace. Terminate lines.
Updates README.
Chainable setAlpha function
add test for setAlpha return value - #48
Merge branch 'feature/brightness' of https://github.com/levithomason/TinyColor
Adds tinycolor.spin()

Better readme for spin

Cleanup from my own review

more accurate readme, explicit tests

typo

Removes .idea from .ignore, moves spin comments inline

Better readme for spin

Cleanup from my own review

more accurate readme, explicit tests

typo

Removes .idea from .ignore, moves spin comments inline
Merge branch 'feature/spin' of https://github.com/levithomason/TinyColor
Adds tinycolor.mix()
Mix amount default noted in README.md
Consisten amount handling, readable weight calc
Merge branch 'feature/mix' of github.com:levithomason/TinyColor into feature/mix
Spelling fix

Courtesy of a room full of students who like your library. And spelling.
Merge branch 'feature/mix' of https://github.com/levithomason/TinyColor