Bug 1305468 - Don't concatenate assets when PLACK_ENV ne development

Bugzilla/Constants.pm

@@ -234,7 +234,7 @@ use constant CAN_HAS_FEATURE => eval {
 # When true CSS and JavaScript assets will be concatanted and minified at
 # run-time, to reduce the number of requests required to render a page.
 # Setting this to a false value can help debugging.
-use constant CONCATENATE_ASSETS => 1;
+use constant CONCATENATE_ASSETS => $ENV{PLACK_ENV} ? $ENV{PLACK_ENV} ne "development" : 1;
 
 # These are unique values that are unlikely to match a string or a number,
 # to be used in criteria for match() functions and other things. They start