Remove camel case from imageuploadtype in config

This removes the only camel cased option of the config options
**we** added to the config.json.

In auth provider's config parts are a lot of camel cased options
provided. We shouldn't touch them to keep them as similar as
possible to the examples.

Fixes #315

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

lib/config/environment.js

@@ -25,7 +25,7 @@ module.exports = {
   allowfreeurl: toBooleanConfig(process.env.HMD_ALLOW_FREEURL),
   defaultpermission: process.env.HMD_DEFAULT_PERMISSION,
   dburl: process.env.HMD_DB_URL,
-  imageUploadType: process.env.HMD_IMAGE_UPLOAD_TYPE,
+  imageuploadtype: process.env.HMD_IMAGE_UPLOAD_TYPE,
   imgur: {
     clientID: process.env.HMD_IMGUR_CLIENTID
   },