Merge pull request #209 from slang800/gradients1

small fixes for gradients (another chunk of #192)
Blueprint for vendoring, no tests ATM, theyll come soon
to top left -- bottom right etc. support
Changing the vendorize for gradients, border-images and transtions to external js function instead of buggy Stylus hacks, fixes #94
Added radial-gradient tests + a fixed some bugs and fixed all the tests to apply the legacy syntax
Added reverse fixing for official gradient values, like `top` to `to bottom`
refactoring + code style fix
More tests + accept em&px for normalizing color stops
Merge pull request #2 from Panya/patch-1

refactoring + code style fix
Merge pull request #2 from kizu/new-gradients

New gradients
added check leaks to mocha.opts
Changed the vendor plugin to be used in .styl, so literal nib import would work
Merge pull request #3 from slang800/gradients

Gradients
Merge pull request #4 from kizu/slang-master

Better usage of vendor helpers