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

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https://hg.mozilla.org/integration/gaia-2_1/rev/e6c8c39f1ca7
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1090149 - Ignore opening timeout is app is killed

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https://hg.mozilla.org/integration/gaia-2_1/rev/7ac18018d090
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1087475 - [Flame][Camera]The viewfinder will fail to function when the user opens and closes the camera app multiple times via the home button

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https://hg.mozilla.org/integration/gaia-2_1/rev/7b59c55996c1
Author: mai <mri@tid.es>
Desc: Bug 1088575 - [LockScreen][EmergencyCall]After click 'More info' in app permission, enter emergency call will get all functionalities broken
Bumping manifests a=b2g-bump