Update README.md
Add WINDOWS_STORE symbol to WindowsStore csproj
Correct MeasurementProtocol user timing format.
Protect against duplicate sessions if app crashed.
Add session update protection to Urchin.
Cache window size for cross-thread/null scenarios.
Ignore MS AdSDK exceptions.
Sync Analytics and Measurement exception handling.
Measurement Protocol Session Control end support.
AutoMeasurement pagename + session end support.
Only end MP sessions when actually requested.
MP protocol "tracker" class names now "builders"
Urchin "tracker" class names now "builder"
Carry forward 'cd' parameter for MP.
Improve MP session control after end.
Correct AutoAnalytics StartAsync example usage.
Correct background upload interval timing.
Trial new AutoMeasurement start-up process.
Add custom dimensions and metrics to MP.
Limit persisted requests to 50 per session.