FIXED - white-screen in UI

Removed cache headers from run-time generated JS file that was causing a 'white screen' in the UI when switching between protocols. https://github.com/BrowserSync/browser-sync/commit/069927a99e7a9ace2ea008162a16410d6228c340

• Issue https://github.com/BrowserSync/browser-sync/issues/1152
• UI fix https://github.com/BrowserSync/UI/commit/b09c5941140ba54796ed9f84ebde982388d9e7a3

FIXED - accept port option as a string

There was a regression from a dependency. I've now pinned the version to the latest that works :) https://github.com/BrowserSync/browser-sync/commit/348597eee66262d5ea15085aa12614ba3ea638e4

• Issue https://github.com/BrowserSync/browser-sync/issues/1254

FIXED - don't register event handlers when ghostMode disabled

Previously Browsersync would always register things such as click/scroll on every page load, but if you had set ghostMode: false we just wouldn't attempt to replicate those actions across devices.

This was intentional as it allows the user to re-enable these options within the UI without requiring a full page reload, but on reflection that is very much 'unexpected' behaviour, so following this release no listeners will be registered if you explicitly opt-out of them via your configuration.