Removed the synchronous versions of functions from the AsyncSeq module; these were basically just aliases for the async-based functions, and it's simpler to have just one implementation of each function. Non-async functions can be adapted to async by using the "lambda+workflow" style (for examples, see the tests for ExtCore's workflow-based collections functions) or function composition (e.g., with async.Return).
Stubbed unit tests for the functions in the AsyncSeq module.
Minor tweaks to the LazyList documentation.