Added button to theme selection

Added “select Theme” button to theme selection.

Conflicts:
	css/jetpack-start.css
	views/steps/select_theme.php
New 3 option modal front-end code

3 options for the user once they land on their site.  This will pop up
automatically.
Tweaks to connect step

- Changed h1 title for connect step
- Added assurance to connect step that we won’t post without their
permission
-

Conflicts:
	css/jetpack-start.css
	views/steps/connect_social.php