Merge branch 'add_build_cookbook_option' into 'develop'

Add a BUILD_COOKBOOK cmake option to control cookbook build targets

See merge request orfeotoolbox/otb!258

CMakeLists.txt

@@ -455,7 +455,9 @@ add_subdirectory(Utilities/Doxygen)
 
 add_subdirectory(Utilities/Completion)
 
-if (BUILD_DOCUMENTATION)
+option(BUILD_COOKBOOK "Build the CookBook documentation." OFF)
+
+if (BUILD_COOKBOOK)
     add_subdirectory(Documentation/Cookbook)
 endif()