Remove support for the Cedar-10 stack (#21)

Since it's no longer possible to build a cedar-10 app anyway:
https://devcenter.heroku.com/changelog-items/755

Author: edmorley

README.md

@@ -64,7 +64,6 @@ Some settings are configurable through app config vars at runtime:
 
 - ``STUNNEL_ENABLED``: Default to true, enable or disable stunnel.
 - ``STUNNEL_LOGLEVEL``: Default is `notice`, set to `info` or `debug` for more verbose log output.
-- ``STUNNEL_FORCE_TLS``: Default is unset. Set this var, to force TLSv1 on cedar-10.
 
 ### Multiple Redis Instances
 

bin/stunnel-conf.sh

@@ -2,13 +2,6 @@
 URLS=${REDIS_STUNNEL_URLS:-REDIS_URL `compgen -v HEROKU_REDIS`}
 n=1
 
-# Enable this option to prevent stunnel from using SSLv3 with cedar-10
-if [ -z "${STUNNEL_FORCE_TLS}" ]; then
-  STUNNEL_FORCE_SSL_VERSION=""
-else
-  STUNNEL_FORCE_SSL_VERSION="sslVersion = TLSv1"
-fi
-
 mkdir -p /app/vendor/stunnel/var/run/stunnel/
 
 cat >> /app/vendor/stunnel/stunnel.conf << EOFEOF
@@ -22,7 +15,6 @@ options = SINGLE_DH_USE
 socket = r:TCP_NODELAY=1
 options = NO_SSLv3
 TIMEOUTidle = 86400
-${STUNNEL_FORCE_SSL_VERSION}
 ciphers = HIGH:!ADH:!AECDH:!LOW:!EXP:!MD5:!3DES:!SRP:!PSK:@STRENGTH
 debug = ${STUNNEL_LOGLEVEL:-notice}
 EOFEOF