Fix iOS8 crash in background mode.
Add system version check functionality in UIDevice+RTCDevice category.
Check for iOS system version when handle capture session interruption.

BUG=webrtc:7201

Review-Url: https://codereview.webrtc.org/2733773003
Cr-Commit-Position: refs/heads/master@{#17079}
diff --git a/AUTHORS b/AUTHORS
index e014bfb..fb8965b 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -12,6 +12,7 @@
 Christophe Dumez <ch.dumez@samsung.com>
 Cody Barnes <conceptgenesis@gmail.com>
 Colin Plumb
+Dmitry Lizin <sdkdimon@gmail.com>
 Eric Rescorla, RTFM Inc. <ekr@rtfm.com>
 Frederik Riedel, Frogg GmbH <frederik.riedel@frogg.io>
 Giji Gangadharan <giji.g@samsung.com>