Merge pull request #98 from hintjens/master

Small naming fixes
Merge pull request #99 from hintjens/master

Fixed examples, and other changes
Merge pull request #100 from hintjens/master

Problem: needs more examples
Merge pull request #103 from hintjens/master

Added note to clarify policy for embedded apps
Merge pull request #107 from hintjens/master

Updated to work with CZMQ/2.x
Merge pull request #108 from hintjens/master

Fixed Travis CI build for security
Removed FileMQ support from libzre

The file transfer stuff was rather ugly and hacked into Zyre. It would be
better to do this on top of Zyre's messaging rather than beside it. It
also makes Zyre more complex than it needs to be.