Make current-property available in function evaluation context
Add unit test
Fixes #1214. Regression: for...in trips on curly braces
Correct name of MDN in --help documentation

The site was formerly called the Mozilla Developer Center (MDC) but now
goes by Mozilla Developer Network (MDN).
Merge branch 'pr/1211'

* pr/1211:
  Add unit test
  Make current-property available in function evaluation context
Merge branch 'pr/1218'

* pr/1218:
  Correct name of MDN in --help documentation
0.40.3