fix(card): add camel-cased selectors to content projection

[crisbeto]

Fixes the camel-cased selectors for mdCardTitle and mdCardSubtitle not being added to the content projection selector.

Fixes #6816.

@jelbourn this seems along the same lines as #5647, should I get rid of the dash-cased selectors while I'm at it?

[julianobrasil]

Shouldn't it also be changed in card-header.html?

[kherock]

Can I interject with one other related question? Shouldn't md-card-header, md-card-content, md-card-actions, and md-card-footer all support camel-cased attribute selectors as well? They're all technically directives and I've been using the equivalent dialog container components using the attribute selectors for some time.

[julianobrasil]

@crisbeto, once there's no @Component decorator associated, I would expected to find camelCase attributes to all of them. At least it was what I got from this: #6720 (comment) (unless there is any specificity related to md-card).

[jelbourn]

@andrewseguin where did we leave off when we last talked about these? This was one of the special cases we said we'd figure out later

[andrewseguin]

I think we ought to sit down and look at the list of outstanding selectors we want to review to decide on how we move forward on it. Will bring it up with the team and see if we want to schedule something.

With regard to this issue, looks like this fix needs to go in regardless

[andrewseguin]

Just gotta rebase

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