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

========

https://hg.mozilla.org/integration/gaia-central/rev/3e61ebc75d30
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13665 from bebef1987/delete_contact

Bug 938051 - Intermittent failure in test_delete_contact

========

https://hg.mozilla.org/integration/gaia-central/rev/a1e055951dc1
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 938051 - Intermittent failure in test_delete_contact

========

https://hg.mozilla.org/integration/gaia-central/rev/f97754980553
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #13535 from EverythingMe/936544-collections-dedup

Bug 936544 - [e.me][bug] Cloudapps do not get deduped in Collections [r=...

========

https://hg.mozilla.org/integration/gaia-central/rev/57a4d8063b79
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 936544 - [e.me][bug] Cloudapps do not get deduped in Collections [r=ranbena]