undef, gep, invoke instruction translation added.
Added llvm librairies detection.
Added Makefile.am
Added indirectbr instruction to TODO.
Added a memory to env type: local llvalues are binded to an Ast.ident
(needed by lot of instructions and values such as VALUE_Ident).
lookup_fn (equivalent of Llvm.lookup_function) and
lookup (look for llvalue in local memory) added.
Merge branch 'master' into llvmgateway
Module/declaration/definition/block implemented.
Removed useless functions.
Fixed global/declaration/definition/modul functions.
Fixed block and definition functions. Need tests but should be OK.