Install Scripts: Install node.js and ewd.js

Add new script ewdjs.sh that will install node, nodem, and ewdgateway2.
This also configures the environment to use ewd.js in a default
configuration.

GTM/install.sh: Link shared library into the linker/loader search path,
so nodem (and others) can find it.

Change-Id: I2555b046868df5d1a0b05b30da13f6b12fcedaf4