fixed windowsservice 'getState' (status) and 'Start' methods; and added some Debug::Trace... calls
Execution::Platform::Exception now inherites from StringException so caught/displayed in a few more places (@todo - must redo exception code using C++11 exceptoipns)
cleanup docs and exception handling in Samples/SimpleService - incldunig adding docs about install/uninstall
Framework/Service todo
Added Main::GetServiceIntegrationFeatures () Service feature - and used that to conditinally display install/uninstall in usage display