require tab step when calling goToStep and update project create tabs to use action/goToStep. note: keeping the link-to in the tabs for seo
use StandardTabController for org and bank tabs in project edit
add missing donation model
clean up project create tabs to only use one code path for triggering a save
remove donationpreview from BB
fix save logic for project create tab changes - abort transition unless save succeeds
call resolve/reject on the parent promise
Merge pull request #462 from onepercentclub/feature/fix-tab-steps

Clean up project create tab steps