Split IndexKeysBuilder typed tests into own class/file
CSHARP-874 - Support for text index in the index builders
CSHARP-874 - Typed builder/test for text index language override field
CSHARP-874 - Modified text index creation to use the index builders
CSHARP-874 - Made the generic and non generic versions of the options builder the same for consistency.
CSHARP-874 - Add overload to allow string[] fields to be indexed using the typed builder
CSHARP-874 - Change string[] to IEnumberable<string> for the Text index
Fix some tests that are failing with the latest nightlies (the server no longer appears to allow a zero valued timestamp as the _id value).