Add cmake config files

cmake/Eigen3Config.cmake.in

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+#                                               -*- cmake -*-
+#
+#  Eigen3Config.cmake(.in)
+
+# Use the following variables to compile and link against Eigen:
+#  EIGEN_FOUND              - True if Eigen was found on your system
+#  EIGEN_USE_FILE           - The file making Eigen usable
+#  EIGEN_DEFINITIONS        - Definitions needed to build with Eigen
+#  EIGEN_INCLUDE_DIR        - Directory where signature_of_eigen3_matrix_library can be found
+#  EIGEN_INCLUDE_DIRS       - List of directories of Eigen and it's dependencies
+#  EIGEN_ROOT_DIR           - The base directory of Eigen
+#  EIGEN_VERSION_STRING     - A human-readable string containing the version
+#  EIGEN_VERSION_MAJOR      - The major version of Eigen
+#  EIGEN_VERSION_MINOR      - The minor version of Eigen
+#  EIGEN_VERSION_PATCH      - The patch version of Eigen
+
+set ( EIGEN_FOUND 1 )
+set ( EIGEN_USE_FILE     "@EIGEN_USE_FILE@" )
+
+set ( EIGEN_DEFINITIONS  "@EIGEN_DEFINITIONS@" )
+set ( EIGEN_INCLUDE_DIR  "@EIGEN_INCLUDE_DIR@" )
+set ( EIGEN_INCLUDE_DIRS "@EIGEN_INCLUDE_DIRS@" )
+set ( EIGEN_ROOT_DIR     "@EIGEN_ROOT_DIR@" )
+
+set ( EIGEN_VERSION_STRING "@EIGEN_VERSION_STRING@" )
+set ( EIGEN_VERSION_MAJOR  "@EIGEN_VERSION_MAJOR@" )
+set ( EIGEN_VERSION_MINOR  "@EIGEN_VERSION_MINOR@" )
+set ( EIGEN_VERSION_PATCH  "@EIGEN_VERSION_PATCH@" )

cmake/UseEigen3.cmake

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+#                                               -*- cmake -*-
+#
+#  UseEigen3.cmake
+
+add_definitions     ( ${EIGEN3_DEFINITIONS} )
+include_directories ( ${EIGEN3_INCLUDE_DIRS} )