[chirp_users] New Daily Build

[Build System]

Greetings,

A new daily build of CHIRP is available.  This includes changes made
directly to the tree yesterday, and may include additional features,
bug fixes, and/or bugs.  If you are interested in trying it, grab it
from the following location:

  http://trac.chirp.danplanet.com/chirp_daily/daily-20171204


A list of the changes included in this build (since the last daily)
follows:

Changes for Build #508
[Jim Unroe <rock.unroe at gmail.com>] [RT21] Tigthen Image Detection

The RT26 images are inadvertenly detected as an RT21 image. This patch
tightens up the image detection of the RT21 driver.

#5415

[Jim Unroe <rock.unroe at gmail.com>] [RT26] Retevis RT-26 UHF Radio

This patch adds memory and settings support for the Retevis  RT-26.

#5413