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

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https://hg.mozilla.org/integration/gaia-2_0/rev/2453bda4713b
Author: crdlc <crdlc@tid.es>
Desc: Bug 1022474 - Cannot add an e.me app to the homescreen via wrapper

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https://hg.mozilla.org/integration/gaia-2_0/rev/4a65292098dc
Author: crdlc <crdlc@tid.es>
Desc: Bug 1022390 - [Vertical] Cancel download of apps

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https://hg.mozilla.org/integration/gaia-2_0/rev/2f2152abc56f
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 1022488 - Show search grid on submit

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https://hg.mozilla.org/integration/gaia-2_0/rev/42c3bd7945d4
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 1022098 - Icon display refactoring

  - Only cache icon results on the homescreen and not for the app:// protocol
  - Move default icon into the gaia_grid webcomponent
  - Ensure default icon is displayed for all users of the webcomponent

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https://hg.mozilla.org/integration/gaia-2_0/rev/daf7db4b4162
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1023631 - [collections] Smart collections should still display even if we cannot fetch the background image r=lightsofapollo
Bumping manifests a=b2g-bump