Add a manual build script for the benefit of OCaml 4.00.1 users

OCaml 4.00.1's ocamlbuild doesn't understand native.o

Signed-off-by: David Scott <dave.scott@citrix.com>
Update CHANGES for 0.2

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #13 from djs55/add-manual-build

Fix build on OCaml 4.00.1