Feat(md-menu) : Added prevent close( when user clicks inside menu panel) feature

[ravinderpayal]

As It's a feature the core team decided to add, and I was in need of this feature for functionality like drop-down menu having some setting controls where user may want to change multiple settings in one go. As currently after every click inside or outside of drop-down menu, it disappears. But adding some additional check based on the value of preventClose @input() supplied parent node can add this desired functionality. Actually I am creating a emoji picker, and have multiple categories of emoji, so user is required to change the category by clicking on tabs(Yeah I am using MD-tabs), menu disappears so this feature will help in accomplishing my specific requirement, and other people's similar requirements.

[agostinalucia]

👏 thanks

[ravinderpayal]

After this feature.

[ravinderpayal]

@alexweber @alexeagle @agostinalucia @mprobst Why not reviewed yet?

[willshowell]

See @jelbourn's related comment here #4842 (comment)

[jelbourn]

@ravinderpayal see #4842 for the discussion of why we do not want to add this feature.

Also note that tagging a bunch of random Angular team members is the absolute worst way to get a PR reviewed.

[ravinderpayal]

@jelbourn sorry sir, our team was in urgent need of disableClose option, so I tagged the team members of Angular 2. But we are thankful to the angular 2 material team for adding md-expansion-panel.

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