Modify call in views to make ES fields optional. Further add caching …

…for es health in handler code

Update static assets

Merge branch 'pydat4-dev'

Merge branch 'django_updates'

Fix list view for pdns.

Identical fix to b420dff.

Bump copyright year.

Better error messages when PDNS fails.

When a PDNS lookup fails, print the escaped response. This makes it
possible to distinguish between nothing returned and an error.

While here, fix whitespace and move a comment to the proper location.

Merge pull request #5 from mpars0ns/master

Fixing issue from a UnboundLocalError Exception

Fix list view.

When viewing a list dataVersion is not included in the filter, so
we have to conditionally add it to any results.

Merge branch 'master' into mongo_include