Update to work without mixins

[RobbieTheWagner]

@cbroeren would you be open to updating this to not use mixins and instead set the contextmenu call up directly? I have it working in my app with {{on "contextmenu" this.contextMenuTrigger}}

[cbroeren]

@rwwagner90 yes, I'm totally open do to so. Let me see if I get some time to do so later this week.

[RobbieTheWagner]

@cbroeren sounds good! I'm happy to help if you'd like. I have it working in my app.