sets up devise for User to authorize securely
migrates User and associates with Goal
creates welcome view to inform, engage, and invite based on drinking water

Trying out responsive design by starting mobile first. Therefore the view looks nice only at 320px width. Used the readable bootstrap theme for its friendly look. Somewhat concerned that there is not enough space around the margins. Perhaps that should be fixed with font is converted to % rather than ems.
adds box shadow, background color, and padding to nav to solidify design
adds js to hide and show content so user sees extra question and registration

When users click on nope, they should be directed to a different "habit campaign." If they run out of campaigns, then there should be a form where they are asked "what their secret is" to setting habits.

adds signup invitation to Welcome#in view to complete engagement