Move frequency paramaters to VJ

-Move frequency parameters from stop_time to vehicle_journey, save at least 3* uint32_t per vehicle_journey
-Enforce arrival/departure time in stop_time to be relative from 0
-Calculate low/upper threshold using relative times and VJ frequency paramaters
Reshuffle VJ struct, save 8 bytes from padding
Reshuffle constructor, resolve order warnings
Kraken: Add start/end_time function
Kraken: use of start/end_time
Ed: Move parsing of start/end_time and headways out of the loop
Kraken: distinguish arrival/departure_time in start/end_time
Merge remote-tracking branch 'vincent/vj_freq_parse' into vj_freq
Remove unused members of JourneyPatternPoint

Removed seemingly unused members in JourneyPatternPoint struct
Reorder members
Reduce sizeof from 48 to 40 bytes
Ed: fix a typo
Merge pull request #4 from l-vincent-l/remove_headway_secs_vj

Ed: fix a typo
Kraken: Initialize destinations that are departures
Jormungandr: add kombu dependency
Merge pull request #448 from l-vincent-l/jormun_dependencies

Jormungandr: add kombu dependency
Jormungandr: Change url to flask restful to https
Merge pull request #449 from l-vincent-l/change_flask_restful_url

Jormungandr: Change url to flask restful to https
Tyr: Change url to flask restful to https
Merge pull request #450 from l-vincent-l/change_flask_restful_url

Tyr: Change url to flask restful to https
Kraken: very small lint
Merge pull request #446 from bliksemlabs/cleanup

Remove unused members of JourneyPatternPoint, thank you!