Add Modify Tree Section
Add Modify Tree Section

* Add modify tree section to the moderation webpage
* Add a description to the modify tree webpage section
* Add a delete element button to the modify tree webpage section
* Add a clear tree button to the modify tree webpage section

2016-ksu-cis-open-house/tree-display,2016-ksu-cis-open-house/tree-display,2016-ksu-cis-open-house/tree-display