Minimum changes required to do "VPATH build"

That is to say, build from a directory other than the source directory.
Merge pull request #142 from codebrainz/vpath-build

Minimum changes required to do "VPATH build"
Merge pull request #141 from hintjens/master

Removed unnecessary check on libuuid
Added address field to Zyre's ENTER message.
Added address field to Zyre's ENTER message.
Merge branch 'master' of https://github.com/mditzel/zyre
Updated the documentation
Merge branch 'master' of https://github.com/mditzel/zyre
Moved ipaddress frame after headers to keep backwards compatibility
Updated comments to be inline with latest changes
Merge pull request #143 from mditzel/master

Added sending peer's IP address to ENTER event
Fixed semantic copy&paste typo.
Merge pull request #146 from l00mi/patch-1

Fixed semantic copy&paste typo.
Merge pull request #148 from hintjens/master

Added zyre_log to public API
Updated copyrights for 2014
Migrated Zyre to using zproto