Fix version detection in version.sh and add testing for it (#225)

* fix version syntax
* commander: verify output of version.sh
* commander: exit setup.sh with code 1 when .env exists
* add commander to travis
* minimal test for commander in core container

base/create-kopano-repo.sh

@@ -6,7 +6,7 @@ set -eu
 function urldecode { : "${*//+/ }"; echo -e "${_//%/\\x}"; }
 
 function version_from_filename {
-	echo "$1" | sed -r 's#[a-z]+-([0-9_.+]+)-.*#\1#'
+	echo "$1" | awk -F"-" '{print $2}'
 }
 
 function h5ai_query {