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

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https://hg.mozilla.org/integration/gaia-2_0/rev/55fa8f5631ab
Author: Zac <zcampbell@mozilla.com>
Desc: Update poor grammar in comments, remove ability to killAll system apps

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https://hg.mozilla.org/integration/gaia-2_0/rev/1f1d17916ee1
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1028941 - gaiatest - Kill only FTU when doing restart, kill all running apps when doing a full reset

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https://hg.mozilla.org/integration/gaia-2_0/rev/adf51b9a4bc1
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 941544 - running_apps should always switch to System frame before executing system javascript

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https://hg.mozilla.org/integration/gaia-2_0/rev/14302a7bb77c
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1033321 - Unable to launch apps with undefined localised names. r=zcampbell

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https://hg.mozilla.org/integration/gaia-2_0/rev/9e80b044678a
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 921939 - Support launching localised apps by name. r=bsilverberg
Bumping manifests a=b2g-bump