add option for directly passing a dict to client
check for 'ok' status instead of passing in a number
use new restapi url builder in helpers
don't pass extension range as argument
add helper for devices
add helper for voicemails
use restapi url builder in device tests
use url builder and helper in extension tests
use url builder and helper in line tests
use url builder and helper in user tests
use url builder and helper in voicemail tests
fix styling issues
refactor fixtures, make them more DRY
add fixtures for device and voicemail