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

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https://hg.mozilla.org/integration/gaia-central/rev/ed5fcefd0c45
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #23171 from yurenju/app-makefile-4

Bug 1029385 - Rewrite app-makefile rule in javascript r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/19632464a672
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1029385 - Rewrite app-makefile rule in javascript r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/74ad04430fc1
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #23082 from crdlc/bug-1050470

Bug 1050470 - touch events not opening apps while scroll is ending

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https://hg.mozilla.org/integration/gaia-central/rev/a5ba6156717e
Author: crdlc <crdlc@tid.es>
Desc: Bug 1050470 - touch events not opening apps while scroll is ending
Bumping manifests a=b2g-bump