Remove getGenCoords() and rename getDOF() to getNumGenCoords()
Don't return array member variable. We provide getter for one element of the array and the number of the all elements.
Merge branch 'origin/master'

Conflicts:
	src/dynamics/Skeleton.cpp
Remove unused variable.
Merge pull request #99 from dartsim/not_to_return_array

Don't return the whole array of class member variable.
Merge branch 'origin/master'

Conflicts:
	src/constraint/ConstraintDynamics.cpp
Fix compiler error due to the last merge.