Modify paginate to take a block for custom concatination of the requests.
Add custom concatination block to Search#search

The search api wraps the results in a layer, this change provides a block to
the paginate method to custom combine the results.
Merge pull request #382 from joeyw/fix-search-pagination

Fix search auto pagination
List org public members

Refs #373
Fix method name in spec description
Fix typo in docs
Merge pull request #383 from octokit/list-org-public-members

List org public members