Plugins no longer need to be separately added to SitePlugins.php; Added 25 plugins

-- Added over 25 new plugins:  AdWeek, Afro, AlbuquerqueJournal,
Amazon, AnalyticTalent, ArkansasOnline, AsheboroCourierTribune,
CareerCast, CareerJet, CellCom, EverettWAHerald, HamptonRoads,
HealthProfressionalsJobsPlus, IEEE, JamaCareerCenter, KCBD,
KenoshaNews, LocalworkCA, LVReviewJournal,  MilwaukeeJournalSentinal,
PharmacyJobCenter, Politico, RetailCareersNow, SeacoastOnline,
StartupHire,  TulsaWorld, Variety, and VirginiaPilotOnline.
-- Plugins no longer need to be separately added to SitePlugins.php.
They are now automatically instantiated as long as they start with a
class name of "Plugin".  Note:  classes named "Plugin*" can now only be
plugins that extend ClassJobsSitePlugin.
-- Added new CareerCast base plugin that many of the new plugins
extend.  Adding a CareerCast-powered site now only takes a few minutes.
-- Addressed a few bugs.
Fixed variable value error in Amazon Applescript