release script builds a zip file for releases

* adds .htaccess files for apache
* adds installation instructions and nginx example
* prevent source folders from being viewed with .htaccess
* adds `index.php` in root folder in case you deploy this whole thing to a subfolder
* updates to work when installed in a subfolder

removed semantic-ui and other unused libraries

loading the home page is now only a single HTTP request

this allows you to use XRay without creating a config file using its default settings (currently only caching disabled)

apparently some people's profile URLs don't get t.co'd

:headdesk:

attempting to fix in php 5.5

closes #18

if the photo has a location, the timezone is set on the published date

If the input URL contains a fragment, finds the DOM tree at that ID and runs the subtree through the mf2 parser.

closes #15

* fields that should be URLs will now be omitted if the value was not a URL, such as when the value is `javascript:alert()`
* makes Mf2 class slightly more self-contained by duplicating the URL helper functions into it
* fixes tests to not cache responses in memcache

errors fetching the URL should not result in a 400 response

closes #9