upgraded to StyleCop.MSBuild.4.7.48.2
updated to NuGet.CommandLine.2.8.0
updated to mspec 0.8.0
ReturnsLazily of task #256
Improved test name
Made Returns of Task to leverage new ReturnsLazily of task
added Task overload of ReturnsNextFromSequence
Added support for Returning Task<T> to ReturnsLazily overloads that take parameters
Created Task helper with FromResult methods to removed taskcompletionsource duplication

Update tests to use fluent assertions

Added missing AssertThatValueProducerSignatureSatisfiesCallSignature to Task-based ReturnsLazily with 1 argument

Fixed incorrect comment about ReturnsNextFromSequence returns null when all values in sequence have been returned

Address issues related to Tasks
Merge pull request #282 from adamralph/update-packages

Update packages
Merge pull request #265 from Dashue/returnslazily_of_task

ReturnsLazily of task #256