Now player will stop current motion and change destinations when a new location is tapped.
Player will only move if the space tapped is empty (i.e. if a tap lands on a bacteria then the player will remain stationary.
Added a Speed attribute to the player's character.
Movement time is now based on player speed attribute. The player's movement speed is constant regardless of the distance traveled.
Player sprite now flips to face movement direction.
Tweak to player speed.
Merge pull request #27 from rhololkeolke/fix-player-movement

Fix player movement