Missing IScheduler parameter

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Adds a hint highlight to methods which have an overload taking an IScheduler parameter. This is highlighted because not defining an explicit IScheduler instance can cause issues when testing and more importantly can cause threading issues such as deadlocks.

Most methods which define overloads that take an IScheduler parameter usually define the default value to be 'Immediate' or 'Current Thread', unfortunately there doesn't appear to be a list defining the default for the extension method in the Reactive Extensions libraries. More information about the different IScheduler types can be found at http://msdn.microsoft.com/en-us/library/hh229042(v=vs.103).aspx.