Added configuration subsection in webinterface

I had some troubles with git so I decided to reopen this request in a new branch (#914 | FLINK-914)
@rmetzger

---------------- Imported from GitHub ----------------
Url: https://github.com/stratosphere/stratosphere/pull/919
Created by: JonathanH5
Labels:
Created at: Mon Jun 09 13:49:29 CEST 2014
State: open