added more submodules

.gitmodules

 [submodule "external/eigen"]
 	path = external/eigen
 	url = https://github.com/eigenteam/eigen-git-mirror.git
+[submodule "external/yaml-cpp"]
+	path = external/yaml-cpp
+	url = https://github.com/jbeder/yaml-cpp.git
+[submodule "external/CxxTest"]
+	path = external/CxxTest
+	url = https://github.com/CxxTest/cxxtest.git

CMakeLists.txt

 ###################
 # External Projects
 ###################
-include(ExternalProject)
+
 ##########################################################################################
 # Eigen, this header-library is used extensively for linear algebra, matrices, and arrays
 # Eigen now has an official mirror on GitHub, so Mercurial is no longer a requirement! 
-ExternalProject_Add(EIGEN
-	GIT_REPOSITORY "https://github.com/eigenteam/eigen-git-mirror.git"
-	UPDATE_COMMAND ""
-	GIT_TAG "3.3.3" #"default"
-   	PREFIX ${CMAKE_CURRENT_BINARY_DIR}/external/eigen
-   	CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_INSTALL_PREFIX}
-)
-include_directories ("${CMAKE_INSTALL_PREFIX}/include/eigen3")
+#ExternalProject_Add(EIGEN
+#	GIT_REPOSITORY "https://github.com/eigenteam/eigen-git-mirror.git"
+#	UPDATE_COMMAND ""
+#	GIT_TAG "3.3.3" #"default"
+#   	PREFIX ${CMAKE_CURRENT_BINARY_DIR}/external/eigen
+#   	CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_INSTALL_PREFIX}
+#)
+#include_directories ("${CMAKE_INSTALL_PREFIX}/include/eigen3")
+
+
+####################
+# Build SubModules #
+####################
+include(ExternalProject)
+
+
+
 
 #############################################################################################
 # Yaml-cpp, this library is used extensively for serialisation of classes (class persistence) 
-#find_package(yaml-cpp)
+find_package(yaml-cpp)
 if (yaml-cpp_FOUND)
     message( STATUS "YAML-CPP FOUND ${yaml-cpp_FOUND}" )
     message( STATUS "YAML-CPP LIBRARIES ${YAML_CPP_LIBRARIES}" )
                    -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE} 
     	           -DYAML_CPP_BUILD_TESTS=OFF
 	)	
-	find_package(yaml-cpp)
+#	find_package(yaml-cpp)
 endif()
 
 # CxxTest 

external/CxxTest

+Subproject commit 48bf84df8a84794cbc3919281f7f95663db9217a

external/eigen

-Subproject commit d58f73408e2b31dcb4244001df551b71f2aa96b6
+Subproject commit 9e97af7de76716c99abdbfd4a4acb182ef098808

external/yaml-cpp

+Subproject commit 5d5bb52ec2825eb4c0c932a9c2d50dc3699f932f