Merge branch 'increase_lfs_size_column' into 'master'

Increase LFS objects size column

Fixes #12745

Increases the `size` column integer limit to an 8-byte integer. This allows for a max value of `9223372036854775807` which is 9,223,372,036 GB. That should do it 😃

I tested this by first reproducing the error (push a file larger than 2.1 GB). The error was:

```
RangeError (3145728000 is out of range for ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Integer with limit 4):
  lib/gitlab/lfs/response.rb:232:in `store_file'
  lib/gitlab/lfs/response.rb:170:in `render_lfs_upload_ok'
  lib/gitlab/lfs/response.rb:51:in `block in render_storage_upload_store_response'
  lib/gitlab/lfs/response.rb:204:in `render_response_to_push'
  lib/gitlab/lfs/response.rb:50:in `render_storage_upload_store_response'
  lib/gitlab/lfs/router.rb:76:in `put_response'
  lib/gitlab/lfs/router.rb:20:in `try_call'
  lib/gitlab/backend/grack_auth.rb:41:in `call'
  lib/gitlab/backend/grack_auth.rb:18:in `call_with_kerberos_support'
  lib/gitlab/backend/grack_auth.rb:8:in `call'
```

Then I ran this migration and pushed the file again. It uploaded successfully.

See merge request !2644

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.4.3
+  - Increase lfs_objects size column to 8-byte integer to allow files larger
+    than 2.1GB
   - Correctly highlight MR diff when MR has merge conflicts
   - Fix highlighting in blame view
   - Update sentry-raven gem to prevent "Not a git repository" console output

db/migrate/20160128233227_change_lfs_objects_size_column.rb

+class ChangeLfsObjectsSizeColumn < ActiveRecord::Migration
+  def change
+    change_column :lfs_objects, :size, :integer, limit: 8
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160120172143) do
+ActiveRecord::Schema.define(version: 20160128233227) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -448,7 +448,7 @@ ActiveRecord::Schema.define(version: 20160120172143) do
 
   create_table "lfs_objects", force: :cascade do |t|
     t.string   "oid",                  null: false
-    t.integer  "size",       null: false
+    t.integer  "size",       limit: 8, null: false
     t.datetime "created_at"
     t.datetime "updated_at"
     t.string   "file"