Add Namespace flag (#21)

* added http-namespace to the flagset

* update description

* added namespace option to the options list

* added namespace as a config parameter

* updated docs

* fix default value override

docs/content/getting-started.md

@@ -129,6 +129,9 @@ If you prefer to configure the service with commandline flags you can see the av
 --http-addr
 : Address to bind http server, defaults to `0.0.0.0:9120`
 
+--http-namespace
+: Namespace for internal services communication, defaults to `com.owncloud.web`
+
 --http-root
 : Root path of http server, defaults to `/`