Add inherit as value for border-bottom-color

Added additional tests to prevent a regression
Fixes #71
CI tests on Node 0.6+ stable versions
Merge pull request #72 from nschonni/add-border-bottom-color-gh-71

Add inherit as value for border-bottom-color
Merge pull request #73 from nschonni/add-addtional-node-env-for-travis

CI tests on Node 0.6+ stable versions
support viewport relative units vh, vw and vm
Merge pull request #74 from bkw/support-vh-vw-vm

support viewport relative units vh, vw and vm