Make more powerful modals

[abhishek97]

• Create a new component modal and wrap modal-dialog component inside it.
• Replace usages of modal-dialog with modal
• Close Modal when user presses esc key

modal-dialog component comes from ember-modal-dialog

[ade5h]

I would like to work on this issue

[coderrsid]

@abhishek97 Can you just elaborate how the modal file structure should be a little more after adding changes, i want us to be on the same page? Thanks.

[vibhuti019]

I would like to contribute to this.