Update test262 summary doc
Merge branch 'test262-doc-update'

Updated summary description of test262 failures.
Improve Array filter() test case

Add test for trailing non-existent elements to demonstrate that they don't
have a non-standard real world behavior like map() and concat().
Merge branch 'array-filter-improvements'

Test case improvements.  Test case now demonstrates that trailing non-existent
elements require no real world non-standard behavior as for map() and concat().
Ditz issue update
Guide gettingstarted.html cleanups
Guide cleanups for programming.html
Trivial fix for guide virtualproperties.html
Merge branch 'guide-typing-cleanups'

Fix a few trivial typing issues in various guide sections.  Add an explicit
example for creating new contexts which either share the globals of another
context, or have a fresh set of globals.
Ditz issue update