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

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https://hg.mozilla.org/integration/gaia-1_3/rev/9e31cdf2dc0a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 982260 - Disable intermittent failing test

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https://hg.mozilla.org/integration/gaia-1_3/rev/2c2798856477
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 982260 - Gaia-integration tests on TBPL fail with: TEST-UNEXPECTED-FAIL | Contacts > Details Merging 15 contacts"

This reverts commit c8dbcfd21a004fa9d7f7a133ebe9431ce557881d.
Bumping manifests a=b2g-bump