First attempt at SchemaLess FlatBuffers.

Change-Id: I86b9d002f3441ef9efdb70e059b8530ab2d74bb8
Tested: on Linux.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a5d9817..3670afe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,6 +30,7 @@
   include/flatbuffers/util.h
   include/flatbuffers/reflection.h
   include/flatbuffers/reflection_generated.h
+  include/flatbuffers/flexbuffers.h
   src/code_generators.cpp
   src/idl_parser.cpp
   src/idl_gen_text.cpp