Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/2f20ae01254c
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #19593 from comoyo/bug796530

Bug 796530 - Add Keyboard for Latin America. r=janjongboom

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https://hg.mozilla.org/integration/gaia-central/rev/a570f0ef9b37
Author: Raniere Silva <raniere@ime.unicamp.br>
Desc: Bug 796530 - Add Keyboard for Latin America

From "Open Web Device - Keyboard Recommendations - Release 1" [1]

    "Numeric and symbols keyboards may be different depending on
    the keyboard language."

Most Spanish Latin America countries use "$" as the currency
symbol instead of "€" [2]. To accomplish this a layout for Latin
America was add.

Note: This is also how Android does it.

[1] https://wiki.mozilla.org/images/2/20/Keyboard_Specs.pdf
[2] http://en.wikipedia.org/wiki/Central_banks_and_currencies_of_Central_America_and_South_America
Bumping manifests a=b2g-bump