Merge pull request #2073 from andymckay/996247

remove ClientData (bug 996247)
Removed AMO code from apps/users/ (bug 1009930)
Fixed some bad imports
Catch up on AMO table removals (bug 999119)
fix by skipping, not sure how to boost to enforce order
Commit from Mozilla Verbatim by user ibai@oihanguren.com.: 864 of 3763 strings translated (26 fuzzy).
Merge branch 'master' of ssh://github.com/mozilla/zamboni
Commit from Mozilla Verbatim by user ibai@oihanguren.com.: 865 of 3763 strings translated (26 fuzzy).
Commit from Mozilla Verbatim by user theo.chevalier11@gmail.com.: 3748 of 3763 strings translated (0 fuzzy).
Log server error for payment setup (bug 1012732)
update legal docs
Only pre-gen APKs for Android apps (bug 1005984)
Allow admins to remove all tags (bug 1012649)

clean_tags already return an empty set when there are no tags,
so that `if` was preventing us from removing all tags from the
the addon.
Merge pull request #2076 from kumar303/android

Only pre-gen APKs for Android apps (bug 1005984)
s/app_types/app_type in API documentation
Merge pull request #2075 from robhudson/migrations

Catch up on AMO table removals (bug 999119)
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Merge pull request #2080 from andymckay/fix-migrations-2

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Remove PayPal related code (bug 1012886)
Commit from Mozilla Verbatim by user ibai@oihanguren.com.: 890 of 3763 strings translated (26 fuzzy).