simplified preg_replace() in san::Filename() function
added page() action() and add() quick access functions to website abstract class
added loadPage() and loadPageFile() functions and supporting code to website abstract class
added page() and action() functions to portal class
replaced / with DIR_SEP in engine class
added support for an array of content in add() and addHead() functions of engine class
moved addHead() function down to be near add() function