[openstreetmap-website] Rake migrate fails on AddMoreChangesetIndexes (#877)

[math1985]

When installing according to INSTALLATION.md, I get the following error. Does anyone have any idea what causes this?
```
user at pc:~/openstreetmap-website > rake db:migrate RAILS_ENV=test
== 28 AddMoreChangesetIndexes: migrating ======================================
-- add_index("changesets", ["created_at"], {:name=>"changesets_created_at_idx"})
   -> 0.0595s
-- add_index("changesets", ["closed_at"], {:name=>"changesets_closed_at_idx"})
   -> 0.0557s
-- add_index("changesets", ["min_lat", "max_lat", "min_lon", "max_lon"], {:name=>"changesets_bbox_idx", :using=>"GIST"})
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::UndefinedObject: ERROR:  data type integer has no default operator class for access method "gist"
HINT:  You must specify an operator class for the index or define a default operator class for the data type.
: CREATE  INDEX  "changesets_bbox_idx" ON "changesets" USING GIST ("min_lat", "max_lat", "min_lon", "max_lon")/var/lib/gems/1.9.1/gems/activerecord-4.2.0/lib/active_record/connection_adapters/postgresql/database_statements.rb:155:in `async_exec'
```

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/877
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