TypedPipe.from(List).distinct fails
Another test case
Remove use of MapAlgebra
Clean up the UniqueID stuff, to avoid plumbing it everywhere
Address Ian's comments
Merge pull request #935 from twitter/jco/typed_pipe_from_list

TypedPipe.from(List).distinct fails
Merge pull request #937 from twitter/uniqueid-clean

Clean up the UniqueID stuff, to avoid plumbing it everywhere
merge with 'develop' to pick up more ExecutionContext changes