removed unnecessary classes and divs

streamlined some code, removed the need to add a separate class to
containers

**NEED TO MIN CSS**
switched .min comments

index.html uses .min.css again — still need to minify css file
bring index-dev up to date for testing
added contact form
add IE fix for form placeholders

from seanherron’s original pull request on pif-interest form
jumbotron / logo code cleanup
add "Thank You" page for contact form
add minified CSS to branch
removed unnecessary code from "Thank You" page
Add contact form

Merge branch 'contact' into clear-for-launch