mGerrit: fix Diff Dialogs across AOSP, AOKP & Gerrit-Review

Now using Apache Commons Codec v1.8 for Base64 conversions
Updated Volley jar to latest codebase
Renamed several Apache classes to avoid conflicts with
    with android.util.Base64
Cleaned up some commented code

Bumped to version 2.02.001

Patch Set 2: Add Apache Commons Codec to Preferences
Patch Set 3: Bump version to v2.02.002

Change-Id: I45f94e390e47c8d56681b692dec5807ed41c954c