Removed old,unused Mashable plugin
Helper function can now display arrays with subarray items
Added several more supported sites; fixed URL issues with a few previous ones
Added support to automatically include all plugins for a given keyword set

New params are
settings_scope="all-sites" ; value = "all-sites" or "all-searches"
excluded_jobsites[]="Monster"

Also fixed plugin configuration issues with Amazon, EmploymentGuide,
SimplyHired and StartupHire