Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/3feb5ff40dcb
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1066024 - Correctly name hi-dpi assets. r=kgrandon

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https://hg.mozilla.org/integration/gaia-2_1/rev/87e8f2004c1b
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 1054718 - [Calendar] Wrong English in error message (automate changing end date/time)
- Update l10n labels as correct strings

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https://hg.mozilla.org/integration/gaia-2_1/rev/2273f454b0b3
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Bug 1061506 - Icons in contact edit form looking a bit fuzzy

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https://hg.mozilla.org/integration/gaia-2_1/rev/88dfec63e98e
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1062809 - [Contacts] Strange icon shown in the ICE Contact list when the Contact doesn't have picture

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https://hg.mozilla.org/integration/gaia-2_1/rev/a61dc74a1d31
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Bug 1061507 - Grey layer on contacts edit form when a photo is present
Bumping manifests a=b2g-bump