Make sure the version variable in Javascript is actually used

[gaqzi]

From the inception of this library the idea was that if there were to be any changes in the emoji library/javascript code then the frontend cache would get reloaded silently.

This was to be handled by a numerical version handled by the core Emoji library.

Before the release of 1.1 the changes that needs to be done is:

• setDataUrl will have to take a version parameter which is the Emoji internal version number as well as a user local version that will just be tacked on.
• The version comparison is a strict string comparison (storedVersion === currentVersion)
• When the version doesn't match then reload the emoji database from the server

[jrabbit]

is this still needed with agressive caching and serviceworkers?