SMCP v0.6.1 Release

[Robert Quattlebaum]

Yesterday I pushed out v0.6.1. It has the following changes:

* Version bump to 0.6.1
* Add `--version` query to `smcpctl`
* configure.ac: Replaced `AM_CONFIG_HEADER()` with `AC_CONFIG_HEADERS()`
* Added contiki examples 'smcp-simple' and 'smcp-plugtest' to `.travis.yml`
* Added contiki examples to `Makefile.am`, so that they are included in
the tarball.
* Various updates and cleanups.
* Various Contiki fixes.
* Make the "smcp-variable_node" no longer be a node. You can now use it
without using the node-router.
* Split off `smcp-inbound.c` from `smcp.c`.
* Do better about avoiding the use of `printf()` (and variants).

The release (with autotools bits) is tagged as `smcp-0.6.1-release`. The previous
release was tagged with `smcp-0.6-release`. This convention will be continued in the
future. The `latest-release` tag has also been updated.

You can download a zip archive of this release here:

* <https://github.com/darconeous/smcp/archive/smcp-0.6.1-release.zip>

I will be making future release announcements on this mailing list.

Enjoy!

-- Robert