Select component docs updates

[adasq]

Contribution link: https://github.com/mseemann/angular2-mdl-ext/pull/1073

Contribution problem description:

Current demo app for select component suggests, that multiple attribute might be assigned with true and false attribute, which is incorrect. Because both:

<mdl-select multiple="true"></mdl-select>

and

<mdl-select multiple="false"></mdl-select>

cases result is initializing component with multiple mode (attribute value false is a string, which is truthly), which can be tricky for new users.

We should use Angular Input Property approach style instead of attribute for multiple property. That's why multiple="true" has been changed for [multiple]="true", so then component property is a boolean value, instead of string.

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