3.9.0 (2017-05-17)

android-permissions: fix PERMISSION property and add requestPermission (ebf4028), closes #1574
app-preferences: suite is sync (3cb8383), closes #1321
background-mode: configure doesn't return anything (92ef4f0), closes #1457
in-app-browser: fix on method (975a65d), closes #1446
media: create should return null if plugin is not available (d68618f)
media: create will always return MediaObject even if plugin doesnt exist (ee4b61e)
printer: fix implementation and add pick method (55071c0)
push: fix types (ca76593), closes #1331
secure-storage: reject the promise if the plugin doesn't exist (#1562) (d5919d1)

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