support passing additional instances to the filter context
rename variables
Merge pull request #52 from dimagi/extra-instances

support passing additional instances to the filter context
handle errors in output refs on question load

http://manage.dimagi.com/default.asp?111497
Merge pull request #53 from dimagi/error-handling

handle errors in output refs on question load
truncate names to fit within 100 characters

http://manage.dimagi.com/default.asp?112581
Merge pull request #54 from dimagi/truncate-names

truncate names to fit within 100 characters
convert links to static assets to dynamic