Added optional LogLevel to CaptureException method.
Added a RavenClient.CaptureException() overload so the JsonPacket's Message can be set explicitly instead of just using Exception.Message.
Merge branch 'master' of github.com:mol/raven-csharp into mol-master.

Conflicts:
	src/app/SharpRaven/IRavenClient.cs
	src/app/SharpRaven/RavenClient.cs
Updated the XML documentation
Changed order of CaptureMessage and CaptureException in RavenClient so they're the same order as in IRavenClient (alphabetical) and updated the XML documentation