Fixes #9
- Added PopulateBatchAsync method to IndexManagementClient class.
This method splits the IndexOperation param array into parts matching the REST API batch limit.
- Added unit test for the List<T>.Chunk() extension method.
Merge branch 'master' of github.com:PulsarBlow/RedDog.Search

Conflicts:
	src/RedDog.Search/IndexManagementClient.cs