Changes from Alvaro Montoro

* Kept your changes with the dropdown.
* Added an alert when the option selected is "Williamson County".
* Fixed the alignment of the checkboxes after removing the absolute positioning.
* Rearranged the code to make it valid (added alt to the images, and changed doctype to HTML5).
* Added the social meta tags and created a thumb for social media (a designed should create a better one).
* Separated the CSS and JS from the HTML (into mappit.css and mappit.js).
Reorganized top-left controls block. Busy spinner now appears below address field.
Reduced margins on top elements to fit better on small (iPhone 4) screens.
Moved busy spinner back to right of controls, but pushed below about icon.
Shorten address field to better fit small device (iPhone 4) screen.