fix(input): Fix input errors CSS to properly display.

[topherfangio]

Due to a CSS property that was not restrictive enough, standard error messages were hidden by default.

Restrict CSS to components with the md-auto-hide class. Note that this unfortunately re-introduces the message flicker bug for messages which do not use the md-auto-hide. This should be fixed when angular/angular.js#12969 is merged and available.

Also, remove the md-maxlength requirement from the errors Hourly Rate demo to reduce confusion.

Fixes #5837. References #5321.

[michaelkrog]

Does this also fix the autocomplete issues?
#5837 (comment)

[topherfangio]

@michaelkrog If your issue was specific to the CSS, then this should fix it as well. However, I updated your Codepen to use my local branch and it doesn't look like the messages are even in the DOM.

Can you take a quick look at your Codepen (http://codepen.io/anon/pen/yeLPVy) and see if it's missing something that you can easily fix? I'd love to test this against the Autocomplete and make sure it works.

[michaelkrog]

Hi @topherfangio.

Something definitely changed in autocomplete. It used to be in the DOM in rc6, but broken because of CSS. Now it seems to be found nowhere i the DOM.

I'll create an issue for it.