Fix NonlinearProgram name in drakeFunction.euclidean.test
Fix drakeFunction.test.sumTest
Split drakeFunction.kinematic.relativePositionTest

Now using drakeFunction.kinematic.RelativePosition in a nonlinear program is
tested in it's own script. The NLP was hitting the iteration limits with
fmincon, so that test has checkDependency('snopt'). The test that just checks
the gradients of drakeFunction.kinematic.RelativePosition should run on any
system.
Merge pull request #2 from avalenzu/include-package-tests

drakeFunction tests should all pass now