fix(tabs): fix last tab wrapping under tab bar

[zakhenry]

Fixes #5439

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[zakhenry]

^ I signed it!

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CLAs look good, thanks!

[ThomasBurleson]

@robertmesserle - can you review please ?

[robertmesserle]

@ThomasBurleson Yea, this should be fine.

[alexandrebrasil]

Simply adding 1px to the width won't solve it for every situation. For example:

1. Go here: http://codepen.io/anon/pen/RWJryx
2. Add 4 tabs with label "LK" (no quotes).
3. The 4th tab is sent to a new line. If you use Chrome, inspect element, go to md-pagination-element container and add 1px to the width inline style. This resolves the issue and the 4th LK tab is shown again.
4. Add 3 more "LK" tabs and manually increase the width by 1px again. The 7th LK tab is still hiddeng because it was kept on the next (paging.width < sum(label.width)). If you add 2px instead of 1px, the tab is shown.
5. If you keep iterating, you'll need to add 3px, 4px and so on...

As far as I can tell, this is happening because the CSS widths of the labels have a fraction, while the element.offsetWidth used to calculate the container width is an integer (so they differ because of rounding/truncation).

See #5794 and PR #5801 for more details.

[zakhenry]

Closing PR in favour of #5801 as demonstrated by @alexandrebrasil