Remove LittleDog example

This depends on parts of Drake's MATLAB support that are going to be
replaced.  We can add it back later if we choose to forward-port it.

.gitmodules

@@ -58,9 +58,6 @@
 [submodule "externals/nlopt"]
 	path = externals/nlopt
 	url = https://github.com/stevengj/nlopt.git
-[submodule "drake/examples/LittleDog"]
-	path = drake/examples/LittleDog
-	url = https://github.com/RobotLocomotion/LittleDog.git
 [submodule "externals/ipopt"]
 	path = externals/ipopt
 	url = https://github.com/RobotLocomotion/ipopt-mirror.git

CMakeLists.txt

@@ -5,7 +5,6 @@ include(CTest)
 
 include(cmake/config.cmake)
 include(cmake/externals.cmake)
-include(cmake/examples.cmake)
 include(cmake/options.cmake)
 include(cmake/package.cmake)
 include(cmake/tools.cmake)
@@ -384,14 +383,6 @@ drake_add_external(director PUBLIC CMAKE TEST PYTHON QT VTK
 
 # END external projects
 ###############################################################################
-# BEGIN examples
-
-# Optional examples
-drake_add_example(LittleDog OFF
-  "planning and control for a small quadruped robot")
-
-# END examples
-###############################################################################
 # BEGIN ros packages
 
 # END ros packages

drake/doc/gallery.rst

@@ -74,7 +74,7 @@ LittleDog Gait Optimization
 
 	<iframe width="560" height="315" src="https://www.youtube.com/embed/Yvg35TGJuFw?rel=0" frameborder="0" allowfullscreen></iframe>
 
-*Source Code:* `drake/examples/LittleDog <https://github.com/RobotLocomotion/LittleDog>`_  (set EXAMPLES_LITTLEDOG to ON in drake-distro cmake options to install it)
+*Source Code:* `drake/examples/LittleDog <https://github.com/RobotLocomotion/LittleDog>`_
 
 
 Strandbeest