Refactoring xpos ypos, etc. into Vector2f
new class: Droppable Upgrade
Fixing tabs/spaces formatting
New track

Added new sound track. I like it, doesn't go with the art all to well in
my opinion, but eh....
Fully converted to the vector system, but bugs
Bugs fixed. ready to work on upgrades
Merge pull request #2 from fsxfreak/master

Finally finished converting to the Vector2f system
Change magic alliance number to enum, upgrades
Upgrade movement change.

Gave the movement for upgrade objects a nice effect. I like it and it's
nice. If you want to see something cool, move that change  -
2*Math.sin(pos.x*Math.PI/180) to the x component on bullets when they're
updated. Super cool effects....could do something with that later.
Pipeline for upgrade types
chance for Enemy to drop upgrades
my very own created upgrade images
refactor, prep for add Upgrade to Player
Merge pull request #4 from SubSage/fsxfreak

Upgrades now drop and have their own images.
Merge remote-tracking branch 'origin/fsxfreak'
Merge branch 'master' of https://github.com/SubSage/GDCalaga
System in place for fire rate upgrade
Consolidate code shared by all entities
Cleanup code for the day, Upgrade collide works
Upgrades kicking in

Some of the upgrades do something to the player now. Just checking to
see that things work really, but decided to leave them in for now. Nice
work.