[FEATURE] add the possiblity to set a active CSS class for menu items.
currently the class for active menu items is "is-active", e.g. for twitter bootstrap templates, the class should be named "active".
this fix add a configuration option, to overwrite the default "is-active".
Revert "[FEATURE] add the possiblity to set a active CSS class for menu items."

This reverts commit d19d11a60f684a21b3ed22d0c9e243d0e75d476b.
[FEATURE] add the possiblity to set a active CSS class for menu items.
currently the class for active menu items is "is-active", e.g. for twitter bootstrap templates, the class should be named "active".
this fix add a configuration option, to overwrite the default "is-active".
Merge pull request #1 from NeoBlack/master

[FEATURE] add the possiblity to set a active CSS class for menu items.