open Ast at the beginning of file in order to avoid warnings.
Added init, set_data_layout and set_target functions for module
initialization / setting.
Doc++.
README updated with new Ez interface.
Added "Limitations" part.
Formatting doc.
Doc++
Removed type aliases, defactorized signature types. Type information
is explicited.
Hidden Env.t type. Env module moved as a submodule of Module.
Env module renamed Local.
Removed [name] parameter in Module.declaration and Module.definition
function (already available in the declaration).
Doc++.
Used AM_CONDITIONNAL in order to determine if LLvmgateway should or
should not be installed. Removed llvm lib installation checking since
 you only need llvm ocaml bindings to build Llvmgateway.
Merge branch 'master' into test

Conflicts:
	Makefile.am
	configure.ac