GULP: default task does not watch the build directories, but runs & terminates.
regenerated the library files: the minified file now sits next to the raw file in the root directory; the clone of the tether lib in /docs/welcome/js has been removed as no-one is referencing that one anyway; all examples point at the unminified tether library for simplified debugging.

Note that docs/welcome/css/prism.css is NOT based on a LESS template, BTW.