Healdsburg Galleries: Misc. Updates

Miscellaneous Updates:
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Added detailed META tags to Head of index.php and artwalk_poster.php.

FOR index.php:
Added Google analytics script.
Added microformats to images and dates ("vevent")
Other minor name change tweaks.

For healdsgal.js: Added microformats to each gallery listing.

For healdsgal.css:
Added style for "brochure-click" link
Added media queries for certain Android devices (device-pixel-ratio: 2)

Added "Back" button to artwalk_poster.php and its CSS.

Modified artwalk_poster.css to add media query for mobile devices, to
scale the header text to fit properly, and to fix the style for the
header to remove overlap of PRINT link.