added `keep_caller_id` option
set `keep_caller_id` to 'true' by default
Added functions check_initial_registration and check_initial_call to see account's initial call/registration status from sup
KAZOO-2972: Check if username is unique
KAZOO-2891: Fix pagination: only using +1 for cdrs
KAZOO-2891: Fix view (less row) this fix  the paginations for descendant and children apis
fix-skel-app: make skel_handlers work properly

remove call to callflow code in whapps_call_command as well
Merge pull request #570 from 2600hz/fix-skel-app

fix-skel-app: make skel_handlers work properly
KAZOO-2885: start a util module for ubiquiti
KAZOO-2885: add a hexencode util
KAZOO-2885: continued to figure out how to generate the api token
KAZOO-2885: clean up hexencode_binary
KAZOO-2885: create/split api tokens for SSO
KAZOO-2885: start to update some macros for new SSO
KAZOO-2885: more tools for SSO api tokens
KAZOO-2885: get strong rand then regular rand if entropy is too low
KAZOO-2972: Remove useless clause
Merge pull request #565 from 2600hz/KAZOO-2972

KAZOO-2972: Check if username is unique
Merge pull request #568 from 2600hz/KAZOO-2891

Kazoo 2891
KAZOO-2885: set account info in response if possible