Update package.json to use new converter.

Throw errors when missing required elements.

"Hobo (authoring) provides error messages for specific errors."
Require name for Data Table Pane.  [#69209814]

https://www.pivotaltracker.com/story/show/69209814
Fix converter bug (hanging conversion). conveter.rb

In some cases with long input / long output and NO ERRORS, #convert would
hang on line 35 'stderr.each_line { … "  – in this case, stderr.stat.size == 0.
Fixes "Delete button text runs together for multiword entries"

[#69211098]

https://www.pivotaltracker.com/story/show/69211098