Deleted unused Ping Command
Deleted DropDatabase command and changed compat code so it's not needed any more.
Removed RenameCollection command.
Removed ListDatabases command and shared functionality between driver-compat and driver
Results of code review - removed RenameCollectionOptions and created a RenameCollectionOperation to encapsulate the functionality.  Improved some of the JavaDoc and moved the tests for rename collection from old test classes to new style functional tests
Results of code review - Added more javadoc, removed a System.out, and moved the only test in DatabaseAdminAcceptanceTest into DatabaseAcceptanceTest.
Merge branch '3.0.x-removing-commands' into 3.0.x
Codereview: 12657010:

Conflicts:
	driver-compat/src/main/com/mongodb/Mongo.java