[mgmt] release: 0.0.15 (the language!)

[James]

I've just released version 0.0.15 of mgmt!

> 328 files changed, 29869 insertions(+), 943 deletions(-)

(Yeah, that's almost 30k+ LOC)

There's some great new stuff that landed since 0.0.14, including:

* THE LANGUAGE (mcl)

* "Deploys": a distributed way to push code into your cluster

* Scheduling (as a reactive function)

* Better testing

* a move to etcd 3.3+ and golang 1.9+

and so much more... This is a monster release. Please try out the
language and all the other new features today :)

NEWS

* We released the language. Please play around with it :) It's time to
get used to this cool new paradigm. Learn more from the...

Blog post:
https://purpleidea.com/blog/2018/02/05/mgmt-configuration-language/

Video:
https://www.youtube.com/watch?v=NxObmwZDyrI

Docs:
https://github.com/purpleidea/mgmt/blob/master/docs/language-guide.md

Function guide:
https://github.com/purpleidea/mgmt/blob/master/docs/function-guide.md

And tons of code all over git master. Check the lang/ folder.

* There is a reactive scheduler in the language. Use your imagination,
or play around with:
https://github.com/purpleidea/mgmt/blob/3ad7097c8aa7eab7f895aab9af22338
c0cf82986/lang/funcs/core/schedule_polyfunc.go#L18

* There is a "deploys" feature. It's not documented yet. You should
poke around if you're curious. Consider this an early soft release.

* There is a FS implementation to store files in a POSIX-like layer on
top of etcd. It's used by deploys. It needs more tests though :)

* The language grew two "simple" API's for implementing functions, so
that new functionality can be exposed in the mgmt language.

* The language grew two ways to specify edges between resources: either
internal to the resource, or externally as standalone edges.

* The language now supports optional resource parameters via the
"elvis" operator. This keeps things type safe and avoids needing an
"undef" or "nil" in the language. This operator also works for edge
declarations.

* New contributor Johan Bloemberg has been on fire sending patches!
He has already made some great improvements to our Makefile for
testing, and the addition of the env* functions in the language, with
much more code pending in open PR's.

* Initial debian packaging has been added. It now needs a maintainer to
build, upload, and love it :)

* We have an early emacs major mode for "mcl", our language.

* Lots of new documentation has been added. Particularly for developers
wanting to contribute to the project.

* We're looking for help writing Google, DigitalOcean, Rackspace, etc
resources if anyone is interested, reach out to us. Particularly if
there is support from those organizations as well.

* See the git log for more NEWS, and for anything notable I left out!

MISC

We're still looking for new contributors, and there are easy, medium
and hard issues available! You're also welcome to suggest your own!
Please join us in #mgmtconfig on Freenode IRC, or ping this list if
you'd like help getting started! For details please see:

https://github.com/purpleidea/mgmt/blob/master/docs/faq.md#how-do-i-con
tribute-to-the-project-if-i-dont-know-golang

Many new tagged #mgmtlove issues were tagged:
https://github.com/purpleidea/mgmt/issues?q=is%3Aissue+is%3Aopen+label%
3Amgmtlove

MENTORING

We offer mentoring for new golang/mgmt hackers who want to get
involved.
This is free and friendly. You get to improve your skills,
and we get
some patches in return. Ping me off-list for details.

THANKS

Thanks (alphabetically) to everyone who contributed to the latest
release:
Carsten Thiel, dsx, James Shubin, Joe Julian, Johan Bloemberg, Jonathan
Gold, jonathangold, karimb, Oliver Frommel, Peter Oliver, Toshaan
Bharvani, Wim
We had 12 unique committers since 0.0.14, and have had 48 overall.
run 'git log 0.0.14..0.0.15' to see what has changed since 0.0.14

Happy hacking,
James
@purpleidea
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