Fix test_dupkey setUp

Change-Id: Idc9c7fd05ed2f278be2b7e82b12261b05ae4dd4b
Add 'couchbase.async' package

Change-Id: Icf57e34e10fcb1e8d11b42346e361442c0ca7946
Added some more async documentation

Change-Id: Ic89cdfa8e08b9d5612109ab83e118b7fe99e2675
Exclude txcouchbase stuff from MANIFEST.in

Change-Id: Ie8be3a797c122076209bfce40fd082522bf4ca48
Document txcouchbase

Change-Id: I611036b67e749c5046741a04c25849732ac42ad4
Add 'txdist' for making separate 'txcouchbase' distribution

Change-Id: I2f638f41025b851280f80c20226333d3ca134d87
Move tests as subpackages

Change-Id: Idb30c851bdae314d0d193e13e217f954977062ac
Add couchbase.tests package to setup.py

Change-Id: I7c6ed7f4e441cfb9837075ff545cde4e30fd5aa3