HOTFIX: Update FireFox add-on download URLS

See
http://stackoverflow.com/questions/15134819/content-type-header-lost-when-using-custom-url
Merge branch 'staging' into production
Merge branch 'staging' into production
Merge branch 'staging' into production
[#42674731] Fixes problem with text fixtures
Merge branch 'staging' into production

Conflicts:
	server/src/main/java/org/activityinfo/server/endpoint/gwtrpc/CommandServlet.java
merging
Merge branch 'staging' into production
Merge branch 'staging' into production
Merge branch 'staging' into production
Merge branch 'staging' into production
Merge branch 'staging' into production
Merge branch 'staging' into production
Merge branch 'staging' into production
Merge branch 'staging' into production
Merge branch 'staging' into production
Merge branch 'staging' into production
HOTFIX: GetAdminEntities query corrected