Introduce SASS stylesheets

Yay for // comments && variables!
Relocate site navigation and footer

Use Jade's include directive for:

	site navigation -> site_navigation.jade
	footer -> footer.jade
Refactor locations page to use fluid layout

* Relocate contact info table to its own file 'contact_info.jade' for
use with include directive.

* contact.jade: Add contact info.

* style.scss: Rename align_left, align_center, align_right to
align-text-left, align-text-center, align-text-right.

* style.scss: Rename heading to heading1 && introduce heading2; remove
usage of text-align.

* style.scss: Add sans-serif font family to note.

* style.scss: Introduce align-left, align-center, align-right for
margin-based alignments.
Add contact info to site_owner var for use in contact_info.jade
Remove site_message.jade (not used)
contact: Disable phone ext form field
style.scss: Use variable names for dark blue, sky blue
Re-style mobile navigation button

* Gray border with black bars
Initial cleanup of practice page
Finish setup of SASS

* Move public/css/*.scss to sass/.

* Remove public/css/*.css -- these are now auto-generated by grunt &
friends or LiveReload (currently still using LiveReload GUI).

* Update README.md file with new dependency info.

* package.json: Add grunt, grunt-contrib-sass to deps.