use HDS feature to return 'lower_is_better' in initial request

It might be better to retrieve lower_is_better when we get the results, but this is easier/prettier.
pass "lower_is_better" to dashboard visualization
draw triangle on dashboard viz, if present in measure
Switching the Gemfile to point back to Cypress for HDS
Merge branch 'lower_is_better_display'

Rebasing and merging Liam's changes for lower is better