Dog starts again in proper position and Some Optimizations

Dog now starts fully on the screen.

Some optimizations were made concerning field access of member
variables. Constants were made static final to increase access speed.
Merge branch 'master' of https://github.com/marcusvsilveira/lehman-android

Conflicts:
	SheepHerder/src/edu/lehman/android/GameSettingsActivity.java
	SheepHerder/src/edu/lehman/android/domain/Animal.java
	SheepHerder/src/edu/lehman/android/domain/Sheep.java
	SheepHerder/src/edu/lehman/android/views/GameSurfaceView.java