Allow unknown options

Author: mishanga

lib/csscomb.js

@@ -38,7 +38,6 @@ Comb.prototype = {
                     var handler = require('./options/' + option).setValue(config[option]);
                     handler && _this._handlers.push(handler);
                 } catch (e) {
-                    throw new Error('Handler ' + option + ' was not found.');
                 }
             }
         });