[ccan] CCAN Update for 2015-05

[Rusty Russell]

Hi all!

        The big news this month is David Gibson as co-maintainer,
which made me clean up infrastructure to allow it.  Maintainers who
push to their modules now automatically trigger webpage updates and
github mirroring.

Module of the Month: ccan/time
==============================

A classic utility module, mainly inline functions and macros.  It
defines structs timeabs, timerel and timemono; these add clarity and
type-safety once you get used to them.

It passes by value, so you can do "if (time_after(t, time_now()))" and
offers time_multiply()/time_divide() as well as the expected
time_add()/time_sub().

New modules:
============
        tal_stack: stack of tal contextes (inspired by talloc_stack)
                (Delio Brignoli)

Minor updates & bugfixes:
========================
	ccanlint: don't segfault on failed module linking (Peter Barker)

Cheers,
Rusty.