Add new lua file for nidalee.
Add model system for all units

Expose get and setModel to lua
Add changes from upstream

To make sure git doesn't complain about conflicts later
Change model system

- Models are now stored at Unit instead of Object
- Added Nidalee Q (only human form)
- Set the side of minions, so they can take damage from spells.
Whoops, duplicate code
Merge pull request #40 from molenzwiebel/master

Create Object model system, used for changing models.