Cheaper IndexedSeq `spanM` without `as` aliasing.  Fixes #266.
After a lookover, fix the other `as`-aliasing issue, and test.
Make IndexedSeqOps subsume VectorOps entirely; Vector.groupWhen comes for free.
Refer to the correct method in the deprecation message for <|*|>
Merge pull request #270 from bmjames/scalaz-seven

Update deprecation message for <|*|> on ApplyOps
Test for issue #266
Merge pull request #268
Make IndexedSeqOps's IS covariant in its param, to avoid surprises in the future.
Merge pull request #269 from S11001001/topic/indexed-seq-ops

Replace VectorOps with a more general IndexedSeqOps