Add Unix install targets that are missing in source

Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -106,6 +106,20 @@ if(APPLE)
     DESTINATION ".")
 endif()
 
+if(UNIX)
+	install(PROGRAMS ${CMAKE_BINARY_DIR}/Witch_Blast DESTINATION ${CMAKE_INSTALL_PREFIX}/share/witchblast)
+	install(
+	  DIRECTORY 
+	    ${CMAKE_SOURCE_DIR}/data
+	    ${CMAKE_SOURCE_DIR}/media
+	  DESTINATION 
+	    ${CMAKE_INSTALL_PREFIX}/share/witchblast)
+	install(FILES
+	  ${CMAKE_SOURCE_DIR}/COPYING.txt 
+	  ${CMAKE_SOURCE_DIR}/readme.txt
+	  DESTINATION ${CMAKE_INSTALL_PREFIX}/share/doc/witchblast)
+endif()
+
 # Packaging
 SET(CPACK_PACKAGE_VERSION "0.7.5")
 SET(CPACK_PACKAGE_VERSION_MAJOR "0")
