The pipeline operator is now '|>'.

Fixes #718.
Remove unused optional argument from Record.{deffunctions, deftypes}.

Fixes #744.
Support indexed Enum.map/2.
Support indexed Enum.each/2.

Fixes #748.
Enum: Use index type consistently.
Add back /> as a deprecated operator.

This commit can simply be reverted when the operator is to be removed.
Add changelog entry about /> -> |>.
Merge pull request #752 from alexrp/record-deffunctions-opt-arg

Remove unused optional argument from Record.{deffunctions, deftypes}.
Merge pull request #753 from alexrp/enum-each-map-iter-index

Support indexed Enum.{each/2, map/2}.
Merge pull request #751 from alexrp/pipeline-operator

The pipeline operator is now '|>'.