Fix for static calls for Service Object

1) Static methods in service call/object (Ex MyClass::Ping() vs MyClass->Ping())
2) Private is determined by checking for the literal underscore '_' in the method name
3) Private function 'checkNumberOfArguments' redundant only called in 'executeServiceCall' using Reflection that could be used for fix 1 & 2
4) Fixed class_exists triggering autoload stack when PluginManager will require when not available.
5) Added drop-down list for services and moved result below selection.  List of services can be extensive.  jQuery change event will trigger page change where method can be called.  Used OptGroup for class names.