Improve flex css prefixes

[karlhaas]

With the following changes the layout of our application works in iOS8

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for the commit author(s). If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.

[ThomasBurleson]

@karlhaas - you will need to sign the Google CLA before any merges can occur.

[karlhaas]

When I follow the link it tells me "It looks like you've already signed this CLA. If you'd like to edit your contact information, you may do so below."

[googlebot]

CLAs look good, thanks!

[ThomasBurleson]

@karlhaas - nice work sir!

[ThomasBurleson]

@karlhaas - plz squash your commits.

[karlhaas]

@ThomasBurleson commits squashed

[ThomasBurleson]

@karlhaas - We are concerned about some performance impacts with this PR.

• This PR was for iOS8 ? Did this address and any other issues
• I do not see a Github Issue associated with this btw.

[karlhaas]

@ThomasBurleson for our application (feedbackr.io) it is very important to support as many devices as possible. According to http://caniuse.com/#feat=flexbox still many browsers need css prefixes for flex.
iOS8 is just one example which I used to test the changes.

Another option (which we don't really want) would not to use flex layout and material for this part of the application.

Could you provide some information regarding the performance impacts? Maybe we can provide a better solution.

[ThomasBurleson]

@karlhaas - see #282.

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