Issue #1637480 by Wim Leers: Fixed Bartik's taxonomy term reference field theme override does not render the field attributes.

Issue #1334344 by jessebeach, mikestefff, Devin Carlson: Fixed During update, Bartik throws an error that () is not defined.

#819996 by amateescu, Jeff Burnz, tim.plunkett, Hoople, bleen18: Fix taxonomy term displays in Bartik.

- Patch #862854 by rjgoldsborough, tim.plunkett, reglogge, Jeff Burnz, amateescu, theresaanna, yoroy: no styling for sticky.

#364470 follow-up by Dave Reid, JohnAlbin, et al: Move submitted by back into a variable. The string approach was too limited.

#790556 follow-up by aschiwi, bleen18, tim.plunkett, jensimmons: Various bug fixes to Bartik's maintenance page template

#875132 follow-up by seutje, sun, Jacine: Better method of preventing contextual links from cutting off in footer.

- Patch #769226 by Owen Barton, sun, effulgentsia, alanburke, bleen18, mfer: optimize JS/CSS aggregation for front-end performance and DX.

- Patch #889100 by Jeff Burnz, rfay: remove bartik_page_alter() and extra block classes because they are not used.

#683026 by jensimmons, JohnAlbin, Jeff Burnz, Jacine, stephthegeek, bleen18, smerrill, et al: New core theme: Bartik, a flexible, re-colorable theme with many regions that shows off what Drupal can do. Truly a team effort. :)