Various updates to the client

-Rocks now show up in the GUI
-Issues with Play/Stop are fixed
-If the World is playing when the user connects, the GUI immediately
begins playing
-"Create New World" button now added to the Menu
-Fixed small spacing issue when displaying critter info
-User now selects serverbase before entering password (only when
connecting the first time)

Still need to do:

Functionality changes:
-Some issues with step. It works, but it is not updating properly.
-Time increment acts really strangely sometimes (like if I enter 1, it
will increase by 2 every second)

Aesthetical changes:
-Fix the dragging issue in the GUI so that it's easier to use
Merge branch 'master' of https://github.com/niranjanravi/Assignment-4