participants-database.php
custom CSS is now written directly to the CSS file in the init method


PDb_Base class
_set_custom_css method writes custom CSS setting to the PDb-custom.css file

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@964992 b8457f37-d9ea-0310-8a92-e5e31aec5664
added new css file PDb-custom.css

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@964996 b8457f37-d9ea-0310-8a92-e5e31aec5664