0.1.5:
	-New weapons!
	-OpenAL sound
	-Supershield powerup
	-Radar

0.1.4:
	-Stability improvements
	-Powerups!  'Guidance', 'Tripleshot' and extra life.  Appear at 
	certain score thresholds.

0.1.3:
	-'Strafing' control
	-General increases in robustness
	-New general look (everything's lit in a red glow now)
	-High score table
	-Configuration data output to ~/.excido/excido.conf at exit
	-Configuration menu
	-Souped up explosions (with extra smoke!)
	-More sophisticated ufo movement (no overlapping)
	-Messier code as I add little things
0.1.2: 
	-Vector-based (ie proper) collision detection, but missile->ufo 
	collision still broken.
	-New effect for missiles hitting things
	-Rewrote config file parser (Config::Load(char*))to be much more robust
	-Added buildings (Obstacle class)
	-Ufos now home in on you only when they have line-of-sight on you
	-Fixed memory leak in Visual::LoadTexture
	-Misc changes/tweaks/fixes (naturally)
	-Started keeping a changelog :-)
	-Rudimentary mouse control.  Screams for strafing, but I'm loathe to do 
	standard FPS controls.  Don't forget to grab the input (default g)

0.1.1: Added menus

0.1:  Initial release
