Fix extra event listener bug

Before, every time the hidePreview function
was called, additional event listeners were being
appended to the DOM. This sorts out that functionality
so that they are only appended when the editor is
initialized.

Author: Paige Bolduc

js/bootstrap-markdown.js

@@ -167,6 +167,10 @@
         this.$textarea.css('resize', this.$options.resize);
       }
 
+      // Re-attach markdown data
+      this.$textarea.data('markdown', this);
+    },
+    __setEventListeners: function() {
       this.$textarea.on({
         'focus': $.proxy(this.focus, this),
         'keyup': $.proxy(this.keyup, this),
@@ -181,9 +185,6 @@
       if (this.eventSupported('keypress')) {
         this.$textarea.on('keypress', $.proxy(this.keypress, this));
       }
-
-      // Re-attach markdown data
-      this.$textarea.data('markdown', this);
     },
     __handle: function(e) {
       var target = $(e.currentTarget),
@@ -418,6 +419,7 @@
         this.$oldContent = this.getContent();
 
         this.__setListener();
+        this.__setEventListeners();
 
         // Set editor attributes, data short-hand API and listener
         this.$editor.attr('id', (new Date()).getTime());