modernize project file.
remove zguide ns prefix.

the prefix prevents running the examples with lein due to the
inconsistency between namespace and src dir hierarchy.

use top-level namespaces for now.
update readme, use markdown.
Merge pull request #468 from mknoszlig/master

Update Clojure examples
port to cljzmq.
Escape double slash inside teletype text section

This prevents interpreting double slash as starting of italic text section and messing the markup outside teletype text section
fix and port to cljzmq.
add caveat for interop between jzmq/jeromq.
Merge pull request #469 from dstftw/markup-fix

Escape double slash inside teletype text section
Merge pull request #470 from mknoszlig/master

Port asyncsrv and peering1 to cljzmq, small README update.
Merge branch 'master' of https://github.com/imatix/zguide
adds ppqueue/ppworker examples; adds time-management functions to ZHelpers