Alef/newmerge

[afederici75]

Motivation and Context (Why the change? What's the scenario?)

-Ported additional tests from FML's original repo
-Added Elasticsearch support for TestMemoryFilters and TestCosineSimilarity

High level description (Approach, Design)

Changes in Elasticsearch:

-Removed all Free Mind Labs, Inc. copyright in both extension and test project.
-Refactored IndexNameHelper and turned it into a static class.
-Adjusted ElasticsearchMemoryDb to the changes in IndexNameHelper.	

Elasticsearch.UnitTests

-Removed Usings.cs
-Created MemoryDbFunctionalTest which descends from KM's BaseFunctionalTestCase, thus providing access to configuration and other common things.
-Refactored all tests to inherit from MemoryDbFunctionalTest and be consitent with KM's.	
-I had to remove my additional SearchTests. The changes I made to 

All Elasticsearch tests pass:
-DefaultTests (11)
-Additional (35)

Microsoft.KM.Core.Functional.... tests pass:
-TestMemoryFilters
-TestCosineSimilarity

[dluc]

superseeded by #494