People die if they are killed.
Handle collisions by callbacks that cna be overridden
Implement bombs: bullets which destroy enemy bullets
Entities have a visibility
Merge branch 'master' of git://github.com/EightAndAHalfTails/minimal-danmaku
Merge branch 'master' of git://github.com/Barrucadu/minimal-danmaku
Fix all the things
Fix collision wuth bullets
Merge branch 'master' of git://github.com/Barrucadu/minimal-danmaku
Implement resetting
Merge branch 'master' of git://github.com/Barrucadu/minimal-danmaku
Save current stage in globals
Preserve player state when resetting
Preserve score
Merge branch 'master' of git://github.com/Barrucadu/minimal-danmaku
Added customisation of BasicEnemy's speed and velocity in the constructor
Added boss enemy and missile-style bullets