initial support for tuple destructuring statements (parallel assignment)
#520
destructuring for entries #520
cleanup
test for entry desctructuring
much better lookahead for destructuring #520
minor improvement to grammar
tests for imported member classes of objects
Merge branch 'master' into constructors
squash an error when importing an object declaration in the current pckg
fix bug with imported types from anon objects
Merge branch 'constructors'