Preparing to abstract version number from setup.py

Made globbing for tangelo directory a bit less shotgunny

Configuring setup.py via "copy only" operation
Abstracted version from setup.py
Abstracted version number from core.js
Abstracted version number from documentation.
Merge branch 'version-num-abstraction'

The version number is specified in exactly one point in the sources now -
CMakeLists.txt in the top level.