Changed the type of SentryRequest.Data from dictionary to object to better fit its description.
Changed the type of SentryRequest.Data from dictionary to object to better fit its description.

getsentry/raven-csharp,xpicio/raven-csharp,webaction/raven-csharp,asbjornu/raven-csharp,getsentry/raven-csharp,xpicio/raven-csharp,getsentry/raven-csharp