use the Boku signup URL from settings
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.
s/app_types/app_type in API documentation
Remove PayPal related code (bug 1012886)
bump(raven): 4.2.3
Merge pull request #2077 from washort/1012886

Remove AMO PayPal code (bug 1012886)
oops missed one
Extract/compile script.  Today's lucky number is 6345.
upgrade dennis to 0.4.2
Merge pull request #2050 from mstriemer/update-boku-signup-docs-url

use the Boku signup URL from settings
Commit from Mozilla Verbatim by user m.araldi.: 3763 of 3763 strings translated (0 fuzzy).
add in altpay (bug 1011122)
Merge pull request #2081 from andymckay/1011122

add in altpay to load prices
Commit from Mozilla Verbatim by user michael.koehler1@gmx.de.: 2492 of 2492 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user markh@babelzilla.org.: 2492 of 2492 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user petercpg@mail.moztw.org.: 2492 of 2492 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user yfdyh000.: 2492 of 2492 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user auzelac91.: 939 of 2492 strings translated (0 fuzzy).
Merge pull request #2078 from diox/fix-removing-all-tags

Allow admins to remove all tags (bug 1012649)
escape the description in reviewer pages (bug 1013347)