* start work on nreisearch aggregates

* port chunks of JRediSearch

* port the rest of aggregates and the highlight/summarize API

* Port QueryTest

* Import all of ClientTest from JRediSearch

* Add aggregate tests; normlaize tests

* NRediSearch : all tests passing

* add source prefix to a bunch of files

# Conflicts:
#	NRediSearch.Test/ExampleUsage.cs
#	NRediSearch/NRediSearch.csproj