rm "0=⍴⍴⍵:"; the joys of being dimension-agnostic

Issue #67
Removed special case for a scalar ⍵ per Jay's comment
https://github.com/ngn/apl/commit/63ed5ee8c594f589de3dff6ec2294a8c9bc397d2#commitcomment-4611123
Merge remote-tracking branch 'origin/master' into gh-pages
built demo