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

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https://hg.mozilla.org/integration/gaia-central/rev/c306064ff00d
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #14182 from gtorodelvalle/contacts-bug-936250-facebook-sync

Bug 936250 - [B2G][Contacts] Canceling FB sync results in the contacts app being unresponsive.

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https://hg.mozilla.org/integration/gaia-central/rev/71329c3d626d
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 936250 - [B2G][Contacts] Canceling FB sync results in the contacts app being unresponsive.

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https://hg.mozilla.org/integration/gaia-central/rev/1c0112a52bfd
Author: ochameau <poirot.alex@gmail.com>
Desc: Merge pull request #14363 from ochameau/touches

Bug 946231 - Enable touch events via the responsive mode. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/40d9906e49f1
Author: Alexandre Poirot <poirot.alex@gmail.com>
Desc: Bug 946231 - Enable touch events via the responsive mode. r=vingetun