apm-agent-nodejs: add 0.x and 1.x branch (#287)

Author: watson

conf.yaml

@@ -764,8 +764,8 @@ contents:
               -
                 title:      APM Node.js Agent
                 prefix:     nodejs
-                current:    master
-                branches:   [ master ]
+                current:    0.x
+                branches:   [ master, 0.x, 1.x ]
                 index:      docs/index.asciidoc
                 tags:       APM Node.js Agent/Reference
                 chunk:      1