delayed connect. use setup(delayed_connect=True)
delayed_connect is now lazy_connect
delayed connect. use setup(delayed_connect=True)
delayed_connect is now lazy_connect
merge 16 into delayed_connect
trying to get travis to use nose instead of py.test
setting up tox for python 2 + 3 testing
use current version of the dev libraries
changelog
'IF NOT EXISTS' for insert statement

The usage is just like 'ttl'.
rename all 'check_exist' related things to 'if_not_exists'
Merge branch 'if_not_exist_insert' of https://github.com/mission-liao/cqlengine into if_not_exist_insert