Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/742818009039
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #16315 from dmarcos/bug960611+bug958200

Bug960611+bug958200

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https://hg.mozilla.org/integration/gaia-central/rev/593f19a43268
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 958200 - [Camera] Update Camera app to use new CameraControl API

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https://hg.mozilla.org/integration/gaia-central/rev/6a16d0c35340
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 960611 - [Camera] Create mechanism to save/load user settings

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "801dd51ab90397cdcf90803fa9239bec5cd04058", 
+    "revision": "74281800903961959bcea4bd8e60d60290aed57b", 
     "repo_path": "/integration/gaia-central"
 }