Asteroids class completed
Drawable Interface implemented
GamePanel implemented (800x600 screen size). Minor change to Asteroids
implementation (setContentPane() -> add()).
Merge branch 'master' of git://github.com/dallinray1/ser-215-asteroids into dallinray1-master

Conflicts:
	Asteroids/src/main/Asteroids.java
	Asteroids/src/main/Drawable.java
	Asteroids/src/main/GamePanel.java
Added .metadata directory ignore
Merge pull request #2 from dallinray1/master

more sprites, class changes/additions
entity classes
entity classes
gitignore updated
Merge pull request #3 from garethleonard/master

Entity stuff
Player movement, missiles implemented
Asteroids spawning to Level1State
Merge pull request #4 from dallinray1/master

added title and menu buttons to buttons folder in rscs
Missile spawn location and velocity bugs fixed
Merge branch 'master' of git@github.com:klords/ser-215-asteroids.git
Merge pull request #5 from dallinray1/master

improved resources
Added damage property to Missile class for boss fights
Passed missileDamage to missile constructor. Moved shoot and
removeMissile methods to bottom of methods. Added getter for lives (for
HUD and gameStateManager use).
updated debris Field
Corrected image size (154px -> 150px)