changed app setup task to default first user to superuser
set first user in seeds.rb to superuser as well
updated various messages and prompts to reflect superuser change
specified / updated paper_trail version to fix build
Merge branch 'master' into 753_first_user_superuser (Gemfile.lock issues)

Conflicts:
	Gemfile.lock
Merge pull request #931 from YaleSTC/753_first_user_superuser

resolves #753