Revert "Rename per_page/perPage to limit to comply with Serrano refactoring"

This reverts commit 48e7d6f281f153635887258d2d983c8d4cfd515f.
Revert release version to 2.0.2

The only commit that depended on Serrano 2.1+ was reverted in 86481f1.
This enables clients to be updated without needing to update server
components.