feat(flyout): support short notation $.

[prudho]

Description

This PR is an adaptation from @lubber-de's #2442.

It adds jquery short notation support ($.) to flyout which is made dynamically out of js properties and thus are not bound to an existing dom node.

Previously you always had to select body (which still works) when no existing domnode template exists. Infact the body selector was completely ignored.

Before notation (still supported)

  $('body').flyout({
    title: 'Important Notice',
    content: 'You will be logged out in 5 Minutes',
    actions: [{
      text: 'Alright, got it',
      class: 'green',
      icon: 'save'
    }]
  });

After notation

  $.flyout({
    title: 'Important Notice',
    content: 'You will be logged out in 5 Minutes',
    actions: [{
      text: 'Alright, got it',
      class: 'green',
      icon: 'save'
    }]
  });

[prudho]

Also please note, the removed repaint() function was an artifact from the sidebar module which was useless in this module.

[prudho]

Docs added by fomantic/Fomantic-UI-Docs#369.

[lubber-de]

Please see my little comment 😉

[lubber-de]

I commited my suggested little change myself, i hope you don't mind