Seed data and bugs

Ready for merge.

This PR updates samplestack to use new seed data.
This new seed data, 1.6, uses strings for the "accepted" values, because of an EA-3 bug.  These will go back to boolean when we have the 8.0-1 server to work with.
There are some changes to mary and joe that are in this application data and in the seed data too.

There is a change to /v1/session payload -- rather than returning the array of vote posts for a user, it returns voteCount.  The change mike requested for hasVoted is in place in this PR, although @stu-salsbury and I have discussed implementing hasVoted directly in the questions payload.  Whether browser will get voting working with this PR or needs more discussion is TBD, but what we agreed on for #269 is in place.

Tests are all passing -- though I've noticed an issue with sort-frequency test... it sometimes fails on the first run AFTER dbload is run -- I think this is because of the asynchronous nature of index updates.

The checkbox for 'show resolved only' does not work with this PR in place -- the browser needs to change to look for a string rather than boolean, until we go back to boolean as mentioned above.

In short -- seed-data 1.6 is not available (it probably will be by the time you're looking at this though) , and there's a breaking change to hasVoted and to the 'show resolved only' checkbox.