Adding _li cookie and tests for session vars

Closes #38
Doing the cookie test better-er
Playing whackamole with last_request.session
Adding proper password hashing bits

Closes #43
Merge remote-tracking branch 'origin/master' into password-hashing

Conflicts:
	lib/globallinks.rb
	spec/app_spec.rb
	spec/spec_helper.rb
RuboCop sidestep
Merge pull request #44 from globallinks/password-hashing

Password hashing