Remove old CSS property?

[epugh]

Unknown property ‘-moz-border-radius’. Declaration dropped. is listed in Firefox console. Would you be open to a PR to remove it from https://github.com/odra/ng-json-explorer/blob/master/src/angular-json-explorer.css#L46 ????

[epugh]

This would help me with reducing the number of browser warnings. Here is the PR for the Quepid project that uses this library! o19s/quepid#380