Update the style for the navbar

The .selected class is set based on the most recent URL change in the
NavCtrl.
tweak some of the centering on the home pages and myballot pages

people with sharper eyes than mine insist the text can still be better
centered, along with some of the headers.
Implement the links for social media sharing as a new directive
add some more style to the campaign detail page
update the styling for the primary search page to resemble the given design

Several CSS tricks to get the search box to look right.
Cset includes resizing of several more SVG images.
make the font consistent for the h1 elements on the various pages

This included changing the headers on the campaignTiles to h2, so they
wouldn't pick up the main style.
make the browse address forms look similar to campaign's search forms
Merge branch 'ui-updates' of https://github.com/paulfred/frontend into paulfred-ui-updates
Merge branch 'paulfred-ui-updates'
Merge branch 'master' of github.com:hackoregon/frontend

Conflicts:
	app/styles/_base.scss