[geomoose-psc] GeoMoose Supported NodeJS Vesion(s)?

[Jim Klassen]

I am trying to come up with a policy for which nodejs versions we
officially support for the *build* toolchain.  My general thoughts are
either current LTS (8.9.1 now) or current and previous LTS (now 6.9.x). 
The benefits to two versions is it gives us and others more leeway when
to update things. The benefit to one version is that is likely what we
are testing in practice and it can simplify the build scripts.

The nodejs release schedule is here [1]:
Node 8.x became LTS on 2017-10-31 and will be supported until 2019-12.
Node 6.x became LTS on 2016-10-18 and will be supported until 2019-4.
Node 4.x became LTS on 2015-10-1 and will be supported until 2018-4. 
(We made some efforts to support this version at one point, but it has
not been tested in a long time by me and probably doesn't currently work
with GeoMoose).

I also point out that 8.9.1 doesn't build out of the box on Ubuntu 14.04
because the gcc version is not new enough.  I'm pretty sure Jessie and
16.04 are ok with 8.9.1.

So how do people feel about supporting:

A) Current LTS version of nodejs only.

  or

B) Current and previous LTS versions of nodejs.


(Note: the demo server is still on Ubuntu 14.04 due to MapScript not
being in Ubuntu 16.04.  Of course GeoMoose 3 doesn't care about
MapScript, but we are still hosting GeoMoose 2.9 demo which does.  This
could easily be split up so it isn't the end of the world, just where
we're at now.)

[1] https://github.com/nodejs/Release