RFC: Eval scope

[aviks]

As a replacement for #7 . I think this is a slightly cleaner/simpler solution.

@timholy @rened : Thoughts? We can merge #7 if you don't like this.

Thanks to @timholy for discovering the trick to get current module.

julia> function tst(a); return a*2; end
# method added to generic function tst

julia> require("ZMQ/src/RPCJuliaSer"); using RPCJuliaSer; run_server()

julia> require("ZMQ/src/RPCJuliaSer"); using RPCJuliaSer; c,r = launch_client()
(ZMQContext(Ptr{Void} @0x00000001038a03f0),ZMQSocket(Ptr{Void} @0x000000010389c0e0))

julia> zmqcall(r, :tst, 2)
4

[timholy]

Looks good to me, I like it.