modularize: pull global variables into module scope, add one more example
specify license as cc-by-nc-sa-3.0 unported and add license header
README: fix lists
move examples to extra file to get a nice, clean library
README: link to creative commons website for the full licensing terms
fix british vs. american english
modularize: add module ikea_samla_clip_with_logo() which uses ikea_samla_clip()
rename hooklength => hook_length again which was corrupted during variable moving
Merge branch 'master' into logo

Conflicts:
	samla-locking-clip.scad

Move the dimension variables back to the global scope, since they are used in
both modules now (and will be used in more modules yet); and the SCAD file is
meant to be use<>'d anyways, not include<>d.