Add a CourtListener credit

Ultimately this needs to be provided when the data is queried, rather
than within the page template (to allow other court APIS to be used),
but it’s a start. Per #245.
Eliminate unnecessary stripslashes()

This is breaking our JSON for #245.
Switch from unserializing to json_decoding

Per #245.
Generate better court opinions URLs

Per #245.
Decrease line height of qTip bubbles
Minor code formatting cleanup
Append a trailing slash to request to the Law method

Per #517.
Using U-2009, not the &thinsp; entity

Why use an entity when a Unicode character is available?
Make commenting style consistent
Set the inculde path when loading settings from APC

We set the include path in config.inc.php, but that never happens if we
don’t load the config file, such as when caching constants in APC. So
we must explicitly set the include path when that happens.
Improve section comment
Include social sharing links for individual laws

Per #389.
Put a marigin around the social buttons

Closes #389.
Perform a crude mod_env check

Closes #448.
Add a settings table

For storing and managing site settings. Per # 419.
Store the version number in the config file

Per #419.
Add a function to update the version number in config.inc.php

I’m not sure if this is the best place to put this method, but at least
it’s written now. Per #419.
Include the current version number in the database

Per #419.
Establish an "upgrade" class

Move over update_version_number() from the Parser Controller class.
Include a proper XML header in sitemap.xml

Closes #521.