Hide version of the web server
Merge pull request #2338 from GitLaboratory/patch-2

Hide version of the web server
ES6: Half a dozen more controllers
Allow registering ES6 modules from plugins.
Extract poll plugin controller into an ES6 module.
Merge pull request #2339 from vikhyat/poll-plugin

Partially convert poll plugin to use ES6 modules
FIX: enable button is broken when color scheme is not saved yet
Plugins: Prefix `discourse/plugins/PLUGINNAME` for plugin export names.
Support for automatic registering of initializers from plugins.
FIX: Thanks .gitignore, I missed a necessary file!