add smart connections check
Merge remote-tracking branch 'origin/master'

Conflicts:
	cheap_travel/cheap_travel/connections.py
	cheap_travel/cheap_travel/flights_data/flight_checks.py
	cheap_travel/cheap_travel/flights_data/pricer.py
	cheap_travel/cheap_travel/flights_data/vayant.py
	cheap_travel/cheap_travel/utils.py
merge
merge
make smart connection check