Fix known blank page issue in Safari

There's been a weird edge-case caching issue with Express apps ever
since Safari 7 where users can see blank pages.

This change adds the "jumanji" dependency to fix the issue. Details
about the issue are in its README: https://github.com/Dakuan/jumanji
Merge pull request #128 from ericf/safari-blank-page

Fix known blank page issue in Safari
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Translate into Brazilian Portuguese

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Include pt-BR code in guide.hbs

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Merge pull request #133 from okuryu/more-read-me

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Merge branch 'pt-BR' of github.com:rogeriopradoj/formatjs-site
Remove pt-BR from Guide