Slowed down camera drag, added splines, first implementation of ducks using splines to project route

- Slowed down camera yaw drag from 0.55f to 0.65f (still playing around
with drags to get the best number.
- Added splines to the project. Got scripts and help from Unity's wiki,
files for spline from wiki located at
http://wiki.unity3d.com/index.php?title=Hermite_Spline_Controller
- Added first implementation of ducks to these splines so now ducks
travel in arcs, Hermite polynomials. So far added it so ducks travel
through 3 points for a path, might make more points later on. At the
start of the game ducks start following these paths. Once they reach
the end point they stop, but do not get deleted.
- Added tags to the environment so ducks have the tag "Duck" and waves
of ducks have the tag "Duck Wave".
- Added force to duck when it is shot down so the duck appears to
follow its trajectory (or some of it) when being hit. Looks more
realistic.
- Changed gravity in project from -9.81 to -2. Ducks fell to quickly
with the standard gravity so instead of tacking of a drag to the ducks
when they fell, I just reduced the wntire projects gravity. Should not
do any harm to project since the ducks are the only thing really
dealing with physics.
** My thought to the splines is to have the paths aready set in place
in the editor, paths predetermined, but possibly having like 20 paths.
Then I would instantiate ducks to these paths whenever. Onces ducks
reach the end of spline they will be deleted. Splines should be start
and end roughly 100+ units away from the player such as (100, -100,
etc).