[Red Hat Central] Add connector for nodeclipse

Steps to perform:

a) mirror a copy of the latest Nodeclipse update site onto dl.jb.org for reproduceability
b) add that to the 3rd party target platform used for building RH Central
c) create a connector in Central for installing Nodeclipse into BOTH devstudio and jbosstools

(Mirroring step removed because we don't yet have confirmation from Legal that we are permitted to redistribute. So instead we'll just link to upstream remote site.)

The list of features to include will be those recommended in the screenshots here [1], under the B) UPDATE SITE (BIGGER CHOICE) section, or can be collected based on the existing Eclipse Marketplace connector provided by nodeclipse [2].

[1] http://www.nodeclipse.org/updates/
[2] https://marketplace.eclipse.org/content/nodeclipse

Installed size is about 111M for these 14 features:

org.nodeclipse_1.0.2.201509250223
org.nodeclipse.enide.editors.jade.feature_1.0.2.201509250223
org.nodeclipse.pluginslist.feature_1.0.2.201509250223

com.eclipsesource.jshint.feature_0.10.1.20160216-0911
de.bastiankrol.startexplorer.feature_1.7.0
gitaddon.feature_1.0.0.20140303-0606
markdown.editor.feature_1.2.0.201501260515
net.mihai-nita.ansicon_1.3.1.201508091828
pm.eclipse.editbox.feature_0.70.0.201508180438

org.chromium.debug_0.3.9.201509250223
org.chromium.sdk_0.3.9.201509250223

tern-feature_1.1.0.201511082254
tern-jsdt-feature_1.1.0.201511082254
tern-server-nodejs-feature_1.1.0.201511082254

If any of these assumptions / feature brief details are incorrect, please correct them in this description or add comments to this JIRA.

PR to do mirror, if licenses are allowed:

https://github.com/jbosstools/jbosstools-download.jboss.org/pull/638