updates to demo
remove phpjs from demo
demo: fix codemirror php support
demo: fix title and copyright
bugfix for arguments
fix subscript literal: a[1]
support while
type-juggling -> helpers
implement js_in
begin js-land tests
start js_delete
special case genUnaryExpression for `delete`
fix var getting removed, fix for..in
refactor codegen to remove genX funcs
fix keys() for `for..in`