Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/514eeba803a5
Author: Francisco Borja Salguero Castellano <fbsc@tid.es>
Desc: Merge pull request #11382 from borjasalguero/paris_settings_contact

Bug 901471 - Revamp Contact Settings screen to allow to import / export ...

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https://hg.mozilla.org/integration/gaia-central/rev/2bb3fbad978c
Author: borjasalguero <fbsc@tid.es>
Desc: Bug 901471 - Revamp Contact Settings screen to allow to import / export from / to different sources r=jmcanterafonseca

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "93418295d620c4bac22cac61ddf4dc4fa372d6a7", 
+    "revision": "514eeba803a5f1035e3603cea3b02d2710c5a0da", 
     "repo_path": "/integration/gaia-central"
 }