bugfix for empty gray class name
remove grayscale on hover in ie9
Merge pull request #8 from kununu/bugfix-fade-class

bugfix for empty gray class name
Merge pull request #9 from kununu/ie9-hover

remove grayscale on hover in ie9
use same svg filter in polyfill as in css. fixes #3
Merge pull request #10 from kununu/standardize-svg-filter

use same svg filter in polyfill as in css. fixes #3
update changelog, bump version number