Merge pull request #99 from hintjens/master

Problem: lack support for zproto state machine animation
Problem: The need of a license.xml isn't mentioned in the README
Solution: Explain how to include a license and what it is used for
Problem: Forgot to generate README.txt in README.md
Solution: use gitdown to generate it
Problem: Can't find .7 man page

Obnly this one is searched for in srcdir while still being generated
from txt file and thus being in builddir. Removing srcdir reference as
it breaks out of the tree build of czmq.
Merge pull request #101 from miska/master

Problem: Can't find .7 man page
Problem: `make` tasks assume libtool binary named `libtool`
Solution: Use $(LIBTOOL) instead.
Port of: https://github.com/zeromq/czmq/pull/859
Merge pull request #102 from jemc/master

Problem: `make` tasks assume libtool binary named `libtool`
Problem: not generating MSVC solution files

Solution: copied sln template from CZMQ

Note: untested! I've only done this in the VS2008 template, so we
can test this and then implement for other versions of MSVC.