moved all files MongoDB.Driver.Core into a Core folder and changed the default namespace to MongoDB.Driver.
moved most files in MongoDB.Driver.Core.Tests into Core folder and reset the default namespace of the project to MongoDB.Driver.
fixed the namespaces of all the test classes in MongoDB.Driver.Core.Tests.
moved classes in MongoDB.Driver.Core.FunctionalTests into Core folder.
fixed namespaces in MongoDB.Driver.Core.FunctionalTests to be MongoDB.Driver.Core in line with their folder structure.
fixed find-replace mistake with assembly info files.