add some makefile magic for creating release & snapshot builds more easily

services/sync/modules/constants.js

@@ -43,7 +43,7 @@ const EXPORTED_SYMBOLS = ['WEAVE_VERSION', 'STORAGE_FORMAT_VERSION',
 			  'ONE_BYTE', 'ONE_KILOBYTE', 'ONE_MEGABYTE',
                           'CONNECTION_TIMEOUT', 'KEEP_DELTAS'];
 
-const WEAVE_VERSION = "0.2.93";
+const WEAVE_VERSION = "@weave_version@";
 const STORAGE_FORMAT_VERSION = 3;
 const ENGINE_STORAGE_FORMAT_VERSION = 3;