WIP: Updated to libcouchbase 2.4.0.

Change-Id: I08e50b59da9d6f546a4cedf699050cc6b447b88c
Implement SDK 2.0 API.

Changed name of a few methods.
Implemented support for DSNs.
Support for SSL.
Bootstrap based connection event.

Change-Id: I5ebaee8a61f9cd9a0e7630d5cf909b79322b4b57