Adding a denoising example using Fields of Experts.

We have permission from Stefan Roth to use the coefficients from his
Matlab toolbox. They have been added as *.foe files.

Change-Id: Ice529e5cab0302b9f27648dd3c8e5ed7b9662aba
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 4b2938b..2307a03 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -54,6 +54,11 @@
                  bundle_adjuster.cc
                  bal_problem.cc)
   TARGET_LINK_LIBRARIES(bundle_adjuster ceres)
+
+  ADD_EXECUTABLE(denoising
+                 denoising.cc
+                 fields_of_experts.cc)
+  TARGET_LINK_LIBRARIES(denoising ceres)
 ENDIF (${GFLAGS})
 
 ADD_EXECUTABLE(simple_bundle_adjuster