cache changelog downloads

Change-Id: Ib4ffc7c276365eeec8df9a22a1bb006ac2f9ebef
disable logging by default

Change-Id: I3932c8e75d0c582b3d80befa7c48c298f2eb082c
cleanup

Change-Id: I55ae8b950909518025e9bf35a83fee5cfcf033e1
Merge pull request #1 from NamelessRom/android-4.4

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