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

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https://hg.mozilla.org/integration/gaia-central/rev/4317e50ef5b1
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #25808 from davehunt/bug1074117-calendar

Bug 1074117 - Use expected conditions and optimise element lookups in calendar app object

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https://hg.mozilla.org/integration/gaia-central/rev/8c15b5b925af
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1074117 - Use expected conditions where appropriate and optimise element lookups in calendar app object. r=fstrugariu
Bumping manifests a=b2g-bump