Added IE9 support which fixed OscarGodson#5,

Note: added a _isIE() function but it should not be used if possible. Where I used it to fix the height issue in preview mode is because I couldn't find where the 2px was coming from. All values of height, padding, offsetHeight, etc were exactly the same as Chrome and Firefox.

epiceditor.js

@@ -79,7 +79,9 @@
     var b = parseInt(_getStyle(el,'border-left-width'))+parseInt(_getStyle(el,'border-right-width'))
     ,   p = parseInt(_getStyle(el,'padding-left'))+parseInt(_getStyle(el,'padding-right'))
     ,   w = el.offsetWidth
-    ,   t = b+p+w;
+    //For IE in case no border is set and it defaults to "medium"
+    if(isNaN(b)){ var b = 0; }
+    var t = b+p+w;
     return t;
   }
 
@@ -92,7 +94,9 @@
     var b = parseInt(_getStyle(el,'border-top-width'))+parseInt(_getStyle(el,'border-bottom-width'))
     ,   p = parseInt(_getStyle(el,'padding-top'))+parseInt(_getStyle(el,'padding-bottom'))
     ,   w = el.offsetHeight
-    ,   t = b+p+w;
+    //For IE in case no border is set and it defaults to "medium"
+    if(isNaN(b)){ var b = 0; }
+    var t = b+p+w;
     return t;
   }
 
@@ -121,6 +125,22 @@
     headID.appendChild(cssNode);
   }
 
+  /**
+   * Will return the version number if the browser is IE. If not will return -1
+   * TRY NEVER TO USE THIS AND USE FEATURE DETECTION IF POSSIBLE
+   * @returns {Number} -1 if false or the version number if true
+   */
+  function _isIE(){
+    var rv = -1; // Return value assumes failure.
+    if (navigator.appName == 'Microsoft Internet Explorer'){
+      var ua = navigator.userAgent;
+      var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
+      if (re.exec(ua) != null)
+        rv = parseFloat( RegExp.$1 );
+    }
+    return rv;
+  }
+
   /**
    * Overwrites obj1's values with obj2's and adds obj2's if non existent in obj1
    * @param {boolean} [deepMerge=false] If true, will deep merge meaning it will merge sub-objects like {obj:obj2{foo:'bar'}}
@@ -320,6 +340,11 @@
     this.previewer.style.width  = this.element.offsetWidth - _outerWidth(this.previewer) - widthDiff +'px';
     this.previewer.style.height = this.element.offsetHeight - _outerHeight(this.previewer) - heightDiff +'px';
 
+    //FIXME figure out why it needs +2 px
+    if(_isIE() > -1){
+      this.previewer.style.height = parseInt(_getStyle(this.previewer,'height'))+2;
+    }
+
     //If there is a file to be opened with that filename and it has content...
     this.open(self.settings.file.name);