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

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https://hg.mozilla.org/integration/gaia-central/rev/25a3b96e9c5f
Author: Trif Andrei-Alin <trifandreialin@gmail.com>
Desc: Merge pull request #15300 from bobsilverberg/tbpl_keyboard

Bug 957122 - Enable more TBPL tests - Keyboard tests

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https://hg.mozilla.org/integration/gaia-central/rev/c230d2d4f159
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 957122 - Enable more TBPL tests - Keyboard tests

Enable test_email_keyboard and test_url_keyboard on TBPL

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https://hg.mozilla.org/integration/gaia-central/rev/2372d8dd17cf
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #15254 from EverythingMe/957978-eme-datastore

Bug 957978 - [Everything.me] Use Datastore to share information between Search and Homescreen E.me clients [r=ranbena]

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https://hg.mozilla.org/integration/gaia-central/rev/ffdfb38156df
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 957978 - [Everything.me] Use Datastore to share information between Search and Homescreen E.me clients [r=ranbena]

b2g/config/gaia.json

 {
-    "revision": "6b9ad7eff499d198092be6c2439e1034335589db", 
+    "revision": "25a3b96e9c5ff89b69b29007462bfd056ad5bf53", 
     "repo_path": "/integration/gaia-central"
 }