Add clear method in CssComposer

src/commands/index.js

@@ -48,7 +48,7 @@ module.exports = () => {
   AbsCommands = require('./view/CommandAbstract');
 
   // Need it here as it would be used below
-  var add = function(id, obj){
+  var add = function(id, obj) {
     if (isFunction(obj)) {
       obj = { run: obj };
     }

src/css_composer/index.js

@@ -3,6 +3,7 @@
  * * [get](#get)
  * * [set](#set)
  * * [getAll](#getall)
+ * * [clear](#clear)
  * * [load](#load)
  * * [store](#store)
  * * [setIdRule](#setidrule)
@@ -231,6 +232,17 @@ module.exports = () => {
         return rules;
       },
 
+
+      /**
+       * Remove all rules
+       * @return {this}
+       */
+      clear() {
+        this.getAll().reset();
+        return this;
+      },
+
+
       /**
        * Add a raw collection of rule objects
        * This method overrides styles, in case, of already defined rule