Improve keyboard support for Calendar.

[MilenaCh]

Feature Request

1. "Today" link in Calendar should be accessed via keyboard.
2. It should be possible to switch to outer view.

For example if user currently is on month view in navigation popup, he should be able to navigate to year, decade and century view via keyboard

http://demos.telerik.com/kendo-ui/calendar/keyboard-navigation

• Kendo UI version: 201x.r.ddd
• jQuery version: x.y
• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

[Xizario]

1. The today link is accessible with pressing Tab key, and then Enter.
2. To navigate outer(upper) view you need to press Ctrl + Up

What need to be still improved is hotkey for directly selecting the Today.
Something like Ctrl+Enter, or Ctrl + Space.

Avoid using Ctrl + T, or any other character, since it is not culturally/language universal.

[Dimitar-Goshev]

The Calendar follows the keyboard specification for Infinite Calendar and the shortcut for focusing the current date is "t". The link for Today is with tabindex -1 as per the aria specification - https://github.com/telerik/web-components-ux/blob/develop/docs/components/calendar/aria.json#L186-L198