Enemy Sprite switch with direction change

Exactly what it says on the tin. Enemy switches from looking left to
right when direction changes. Also fixed a small bug involving the
health leech item. Wasn't a huge deal, but it's been patched. I am going
to bed. I'll see you all in the morning. If something desperately needs
my attention, have someone text or call my phone.
Merge branch 'master' of https://github.com/kvelury/apocalyptia