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

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https://hg.mozilla.org/integration/gaia-central/rev/a95e393bd448
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #10296 from samjoch/bug-800002-GalleryEditModeExposurePolish

Bug 800002 - [Gallery] Edit Mode Exposure Polish r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/336e2719a390
Author: Sam Joch <samuel@guiora.com>
Desc: Bug 800002 - [Gallery] Edit mode exposure polish

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https://hg.mozilla.org/integration/gaia-central/rev/fafd10bbf277
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #12064 from gaye/bump-marionette-helper-007

Bump marionette-helper to 0.0.7

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https://hg.mozilla.org/integration/gaia-central/rev/e8edc6bca78d
Author: gaye <gaye@mozilla.com>
Desc: Bump marionette-helper to 0.0.7

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "d5d7a2b06574778c07fa7bb93af4d346e639b6d0", 
+    "revision": "a95e393bd4484aecd2f51768fa2d50e455084c78", 
     "repo_path": "/integration/gaia-central"
 }