support for multiple iDT calendars configured under same slack team
add UserState.idt_avatar column
implement lib.idt_get_user_info
implement fetch_idt_avatars command
user avatars from iDT API
add slack_team_state as param to idt_get_user_info
abstract IdtOAuth to remove dependency from model
refactor idt header generation
fetch avatar upon UserState creation
change avatar key name in mocks and code from avatar to avatar_url
support for multiple iDT calendars configured under same slack team
add logging in script
Merge branch 'v2-dones-to-slack_avatars'