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

========

https://hg.mozilla.org/integration/gaia-central/rev/a056e1e96998
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #12882 from gasolin/issue-922620

Bug 922620 - Wap push service activated by default, r=arthur

========

https://hg.mozilla.org/integration/gaia-central/rev/5a0d949ddd85
Author: gasolin <gasolin@gmail.com>
Desc: Bug 922620 - Wap push service activated by default