Release Summary for 4.0.52
  Changes to 4.0 after version 4.0.51
  * [X header 4.0 (#3746)  * directory lookup should have X-headers  * tweaks for cache](https://github.com/2600hz/kazoo/commit/441b4b52cfc22025cb92a34f4d18e3b0bb1bef2f) by bitbashing
  * [fix harmless typo (#3745)](https://github.com/2600hz/kazoo/commit/e6d5873071cf813345410aed4e31def107d59e93) by Pierre Fenoll
  * [HELP-30145-4oh: add device configuration for media_webrtc (#3750)](https://github.com/2600hz/kazoo/commit/290436046621df57835cccb0c001036f1ec854cc) by Mark Magnusson
  * [qf-ktn_4oh: allow admins to import numbers as available (#3735)  * check auth account, not assigning account to change module name on import    * qf-ktn: allow admins to import numbers as available    Conflicts:  	core/kazoo_number_manager/src/knm_phone_number.erl    * qf-ktn: make fmt](https://github.com/2600hz/kazoo/commit/38cafa97ab097c8011a1affadd0167fa268aa0bf) by Pierre Fenoll
  * [bump erlang.mk to 2017.05.18 from 2016.01.12 (#3730)  Cause previous tag randomly disappeared!  c.f. https://github.com/ninenines/erlang.mk/issues/703](https://github.com/2600hz/kazoo/commit/766b7bdd3464641f244eb12f1354498ca446cbf8) by Pierre Fenoll
 -- 2600Hz Offical <packages@2600hz.com>  Tue, 23 May 2017 23:43:23 +0000
