Remove componentDidMount function with reload.

Removing the reload (and the whole `componentDidMount` function since
the reload was the only thing in there) makes sure that the container
view isn't reloaded when the DOM changes and so does not make a request
to the container. Because of this change kitematic will not make a
request to the container when hovering over the preference button.

(I wasn't sure if this was used somewhere for real. If it is, I couldn't
find it).

Fixes #333.

Signed-off-by: Kristján Oddsson <koddsson@gmail.com>

src/ContainerHomePreview.react.js

@@ -37,9 +37,6 @@ var ContainerHomePreview = React.createClass({
       });
     }
   },
-  componentDidUpdate: function () {
-    this.reload();
-  },
   componentWillUnmount: function() {
     clearInterval(this.timer);
   },