update linode plans mapping

Closes #351

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
add Linode to LB providers
add linode to loadbalancer types
add SOURCE_IP to loadbalancer algorithms
init linode nodebalancer mappings
init functions
update list_balancers docstring
all new Linode plans are billed hourly
add create_balancer docstring
fix list_balancers params
fix pep8
add _response_to_loadbalancer and ex_create_nodebalancer
init LinodeNodeBalancer object
initialize Uuid, add __repr__ method
fix _response_to_LNB
add docstring to _response_to_LNB
yield LoadBalancers
remove state map since it will be always RUNNING
fix flake8
add extra args to LNB object