Components: set md-select width to width of its longest item

[HegdeSach]

Bug, feature request, or proposal:

Proposal

What is the expected behavior?

configure md-select box to use the width of the longest item.

What is the current behavior?

md-select box has fixed width and it displays ellipsis for the longest item when selected

[kkotak]

Also allow md-select to grow to 100% of its parent container.