Capture stacktrace of exceptions thrown from async (#524)

* Capture stacktrace of exceptions thrown from async

* tidy

Only use the sync context for async delegates (#497)

Performance Improvement - Perform test filtering earlier in process

Performance Improvement - Perform test filtering earlier in process

Performance Improvement - Perform test filtering earlier in process (#…

…433)

* Add test to run one out of 10000 specs

* Prevent multiple enumeration of Contexts

* Move filtering to before Context is created

* Simplify FindContexts to use same pattern as FindContextsIn

* Use IEnumerable extension method

* Display compile diagnostic when compilation fails

* Make parameter optional

* Extend test to track instantiations

* Update src/Machine.Specifications/Utility/KeyValuePairExtensions.cs

Co-authored-by: Robert Coltheart <[email protected]>

* Update src/Machine.Specifications/Explorers/AssemblyExplorer.cs

Co-authored-by: Robert Coltheart <[email protected]>

* Update src/Machine.Specifications/Explorers/AssemblyExplorer.cs

Co-authored-by: Robert Coltheart <[email protected]>

Co-authored-by: Robert Coltheart <[email protected]>

Fix build

Update readme (#380)

* Update README.md

* Update README.md

Update packages (#377)