Adjusts firing envelope with sane parameters.
Adds some comments to TrackingModeGuns.
Ups rate of fire and lowers damage per shot.
Ups tracking time a bit.
Increases discrete time period.
Merge branch 'master' into balance

Conflicts:
	src/airf/demo/ManeuverDemo.java
Merge branch 'master' into balance

Conflicts:
	src/airf/demo/ManeuverDemo.java
Fixes a bug in path rendering system.
Fixes a bug in creation of the immelman maneuver.
Refactors Sprites to use a map and a byte.
Fixes transparency in icons.
Implements new graphics and a number of game tweaks in preparation for playtesting.  Implements numerous bug fixes and new features.
Removes loading of unused sprites.
Removes unused logging.
Merge pull request #101 from absolom/balance

Closes #81.