Add VS 2013 build.
Fix up some cross compile, missing header, moved includes, copyleft.
Fix typo in batch build paths.
Add zmq to makefile include and lib.
Add (c), change example into class per file w/hdrs, fix xcomp break.
Update linux test/example builds.
Use include subdirectory.
Missing deployed header.
Add zmq.h includes.
Comments on examples build failure.
Add unit test execution to travis/manual build.
Revert unnecessary zmq.h includes.
Need to build them before run them.
Merge pull request #4 from libbitcoin/develop

VS 2013 solution, test builds, formalize example.