Shows a warning if current company has been switched in another tab or window.
Shows a warning if current (company|user|db) has been changed within another tab or window.
Known issues / Roadmap
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Known issues
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* If the browser don't implement Sharded Worker (http://www.w3.org/TR/workers/#sharedworker), the warning message will not be displayed (there is no polyfill).
* Switching company in a separate browser or in private browsing mode will not be detected by this module. It's a limitation of Shared Wworker(limit to browser session, server:port...)
Updates
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* Jan 2016 : [IMP] add user and db in change detection