chore: re-allow textarea tags

Sorry I change my mind.
We need feedbacks on possible problem with it. So it's not a solution to just prohibit it...

Author: douglasduteil

README.md

@@ -35,8 +35,8 @@ Finally, add the directive to your html,
 as attribute :
 
 ```html
-// Not well supported yet
-// <textarea ui-codemirror></textarea> 
+// Not well supported yet but still... We need feedbacks to improve it...
+<textarea ui-codemirror></textarea>
 
 <div ui-codemirror></div>
 ```

src/ui-codemirror.js

@@ -26,10 +26,10 @@ angular.module('ui.codemirror', [])
           value = iElement.text();
 
           if (iElement[0].tagName === 'TEXTAREA') {
-            throw new Error('NOPE');
-//            codeMirror = window.CodeMirror.fromTextArea(iElement[0], {
-//              value: value
-//            });
+            // Might bug but still ...
+            codeMirror = window.CodeMirror.fromTextArea(iElement[0], {
+              value: value
+            });
           } else {
             iElement.html('');
             codeMirror = new window.CodeMirror(function(cm_el) {