Support tagging instances after they have launched.
add some unit tests for EC2LatentBuildSlave
make botoSetup return connection
don't call create_tags unecessarily
test start_instance with tags
document tags parameter for EC2LatentBuildSlave
skip ec2 buildslave tests if moto not found
remove moto dependency from setup.py
skip ec2 buildslave tests if moto version is not up to date
add lost comma to setup.py
Merge longaccess/buildbot:tags (PR #1067)
Actually skip tests when boto's not installed

+autopep8