Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/0b5e09c20763
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15700 from gentlefolk/948415

Bug 948415 - Make mock_contact.py pythonic, make insert_contact convert it to API-friendly format

========

https://hg.mozilla.org/integration/gaia-central/rev/086acafeb756
Author: gentlefolk <cemacken@gmail.com>
Desc: Bug 948415 - Make mock_contact.py pythonic, make
insert_contact convert it to mozcontact API
friendly format. r=dhunt r=zcampbell

========

https://hg.mozilla.org/integration/gaia-central/rev/2fca9aa99e54
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #16074 from timdream/build-appdata-wappush

Bug 968703 - Migrate code snippet for wapppush customization, r=yurenju

========

https://hg.mozilla.org/integration/gaia-central/rev/fb25b8010f55
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 968703 - Migrate code snippet for wapppush customization from applications-data.js to apps/wappush/build/build.js
Bumping manifests a=b2g-bump