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

========

https://hg.mozilla.org/integration/gaia-central/rev/601a368b2665
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #16793 from asutherland/email-gelam-cleanup

Bug 978012 - [email] Remove dead/obsolete GELAM-built JS blobs and fix GELAM to clean out ext/ before installing. r=mcav

========

https://hg.mozilla.org/integration/gaia-central/rev/b1231f4dee15
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 978012 - [email] Remove dead/obsolete GELAM-built JS blobs and fix GELAM to clean out ext/ before installing. r=mcav

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/289
Bumping manifests a=b2g-bump