Replacing moment.js

[SeBassTian23]

Since the moment.js library is no longer actively developed I consider removing it and replace its used functions with the standard JavaScript date function. Only a few functions were used from the library to begin with so for the most part it should be a somewhat easy replacement.

Formatting the dates might be a little more difficult when it comes to using formats like MMM 'YY but I think it is manageable without too much time invested, so jQuery would be the only dependency for the plugin.