Adds isEnabled property to EditorView.
Removes dependency on sproutcore-upload.
Adds isEditable property to WYSIWYGView piped through to its editor view's isEnabled.
Switches WYSIWYGEditorView's contentEditable property to use isEnabledInPane.
Merge pull request #29 from dcporter/dep

Removes dependency on sproutcore-upload.
Merge pull request #28 from dcporter/enabled

Adds isEnabled property to EditorView.