EAE workaround

[sjdaws]

This PR adds an env variable to force EAE transcodes to be performed locally.

This fixes the EAE timeout! error as worker nodes do not spawn Plex EAE Service.

Error:

[0x7f3a3abfa700] ERROR - [Transcoder] [ac3_eae @ 0x2fd4f40] EAE timeout! EAE not running, or wrong folder? Could not read '/tmp/pms-df2bb8fb-531b-4d33-9822-f24996fca71b/EasyAudioEncoder/Convert to WAV (to 8ch or less)/ynqwgibcfo6byomw1w226ct1_27313-1-2.wav'

ps ax from plex container:

# ps ax
    PID TTY      STAT   TIME COMMAND
      1 ?        Ss     0:00 s6-svscan -t0 /var/run/s6/services
     35 ?        S      0:00 s6-supervise s6-fdholderd
    710 ?        S      0:00 s6-supervise plex
    714 ?        Ssl    0:07 /usr/lib/plexmediaserver/Plex Media Server
    733 pts/0    Ss     0:00 /bin/sh
    765 ?        SNl    0:02 Plex Plug-in [com.plexapp.system] /usr/lib/plexmediaserver/Resources/Plug-ins-757abe6b4/Framework.bundle/Contents/Resources/Versions/2/Python/bootstrap.py --server-version 1.24.3.5033-757abe6b4 /usr/
    814 ?        Sl     0:00 /usr/lib/plexmediaserver/Plex Tuner Service /usr/lib/plexmediaserver/Resources/Tuner/Private /usr/lib/plexmediaserver/Resources/Tuner/Shared 1.24.3.5033-757abe6b4 32600
    839 ?        Sl     0:02 Plex Plug-in [com.plexapp.agents.imdb] /usr/lib/plexmediaserver/Resources/Plug-ins-757abe6b4/Framework.bundle/Contents/Resources/Versions/2/Python/bootstrap.py --server-version 1.24.3.5033-757abe6b4
   1190 pts/0    S+     0:00 vi /app/transcoder.js
   1202 ?        S      0:00 Plex EAE Service
   1404 pts/1    Ss     0:00 /bin/sh
   1411 pts/1    R+     0:00 ps ax

ps ax from worker node:

# ps ax
    PID TTY      STAT   TIME COMMAND
      1 ?        Ss     0:00 s6-svscan -t0 /var/run/s6/services
     36 ?        S      0:00 s6-supervise s6-fdholderd
    832 ?        S      0:00 s6-supervise plex
   2842 pts/0    Ss+    0:00 /bin/sh
   3081 pts/1    Ss+    0:00 /bin/sh
   3099 ?        Ss     0:00 /bin/bash /usr/lib/plexmediaserver/Plex Media Server
   3117 ?        Sl     0:02 node worker.js
   3125 pts/2    Ss     0:00 /bin/sh
   3292 pts/2    R+     0:00 ps ax

[pabloromeo]

Awesome contribution!
And you even updated the README :D! LGTM