Merge pull request #17 from apigee/export-new-plugins

Updating to export newly added plugins.

index.js

diff --git a/index.js b/index.js
index 7e77135..9fc1317 100644
--- a/index.js
+++ b/index.js
@@ -9,5 +9,7 @@
   quota:require('./quota'),
   'quota-memory':require('./quota-memory'),
   spikearrest:require('./spikearrest'),
-  'transform-uppercase':require('./transform-uppercase')
+  'transform-uppercase':require('./transform-uppercase'),
+  json2xml: require('./json2xml'),
+  healthcheck: require('./healthcheck')
 }