Prepare html parser logic
- Observes for paste and drop
function() {
      this.observe("paste:composer", function() {
        var keepScrollPosition  = true,
            that                = this;
        that.composer.selection.executeAndRestore(function() {
          wysihtml5.quirks.cleanPastedHTML(that.composer.element);
          that.parse(that.composer.element);
        }, keepScrollPosition);
      });
      
      this.observe("paste:textarea", function() {
        var value   = this.textarea.getValue(),
            newValue;
        newValue = this.parse(value);
        this.textarea.setValue(newValue);
      });
    }