Using JSON schema in playground (PR #336)

Squashed commit of the following:

commit c9da5ef0415bed17edecb8bbf0536a398afc9562
Author: Nicholas Bollweg <nicholas.bollweg@gtri.gatech.edu>
Date:   Wed Mar 19 13:37:42 2014 -0400

    reorganizing hints

commit 950a6d16c8474003e5a51b730db4d9748894d66b
Author: Nicholas Bollweg <nicholas.bollweg@gtri.gatech.edu>
Date:   Tue Mar 18 12:07:07 2014 -0400

    more cdn

commit 472a1b0360ed19da76e290cbc5340bdd9f81b15a
Author: Nicholas Bollweg <nicholas.bollweg@gtri.gatech.edu>
Date:   Tue Mar 18 11:42:20 2014 -0400

    moving as much as possible to cdn

commit 0639f54605a6754d1f9dcfb880e253f94b60469b
Author: Nicholas Bollweg <nicholas.bollweg@gtri.gatech.edu>
Date:   Tue Mar 18 11:11:11 2014 -0400

    always using jsonlint for parser... but not getting paths back from jsonld

commit d6cffc55f0cb8440faf46d61403051f185c46339
Author: Nicholas Bollweg <nicholas.bollweg@gtri.gatech.edu>
Date:   Tue Mar 18 09:42:12 2014 -0400

    removing complaining source map lines, new schema location

commit 94b9c1d681b01efb13c68c7bfc90f4411263e835
Author: Nicholas Bollweg <nicholas.bollweg@gtri.gatech.edu>
Date:   Mon Mar 17 18:04:46 2014 -0400

    adding use of schema in hint

commit ecb6756361b9e8a8891d20f81d2418fbb8c82a69
Author: Nicholas Bollweg <nicholas.bollweg@gtri.gatech.edu>
Date:   Mon Mar 17 16:00:54 2014 -0400

    using json schema in linter

This closes #336