Add or Update License Headers
Add linq support for counter

Add linq support for counter, value set in object is used for increment.
Add tests
Merge branch '2.1' of https://github.com/mfiguiere/csharp-driver into 2.1-license
Merge branch 'master' of https://github.com/dtretyakov/csharp-driver into translator

Conflicts:
	src/Cassandra/HostConnectionPool.cs
Minor test and tracing fixes for CSHARP-165
Merge branch 'AddLinqSupportForCounter' of https://github.com/Youscribe/csharp-driver
Fixed concurrent work of streams with a host.
Merge branch 'master' of https://github.com/datastax/csharp-driver into CSHARP-164_add_ability_to_set_connection_lifetime

Conflicts:
	src/Cassandra.IntegrationTests/Core/ConnectionTests.cs
	src/Cassandra/HostConnectionPool.cs
	src/Cassandra/OperationState.cs
Fixed connectivity to server.