send $item obj to header
send $tour obj to header
Collect only IDs (not full links) for Google Play and iOS app store links
Collect Twitter username (for use with Twitter Cards, etc)
Site root fix, app store link updates, SEO/TwitterCards/OpenGraph integration

* define root var using PHP in mh_display_map() function: Getting the
site root with PHP is more reliable. Required for subfolder
installations.

*Adds meta tags for Facebook Open Graph and Twitter Cards

* minor SEO improvements