Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/62a79dcae261
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1066557 - roaming is undefined error

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https://hg.mozilla.org/integration/gaia-2_1/rev/fe2cc437a591
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1061401 - Fix multiple activity window orientation issue

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https://hg.mozilla.org/integration/gaia-2_1/rev/37f1164449eb
Author: Adrián de la Rosa <hola@adlr.es>
Desc: Bug 1060101 - [Settings][Facebook] Removing a Facebook account from Contacts will not finish if Facebook was set up during the FTU / FTE

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https://hg.mozilla.org/integration/gaia-2_1/rev/c18488d9f0dd
Author: Adrián de la Rosa <hola@adlr.es>
Desc: Bug 1056647 - [Contacts] Refactor the FB sync schedule and remove it from the app critical path
Bumping manifests a=b2g-bump