Add tests for RpcController#update_feed
Bugfix: use Hash#merge! instead of Hash#merge

params.merge don't modify self so `link` in JSON data will be ignored, so Item.create raises ActiveRecord::StatementInvalid.
Stop modifying `params`, use copy
Accept @makimoto's review

https://github.com/fastladder/fastladder/pull/79#discussion_r3406321
Update factory_girl version with deprecated code cleanup

Creating saved instance with `Factory` has been deprecated since factory_girl 3.x.x.
details: http://robots.thoughtbot.com/post/19412394597/factory-girl-hits-3-0
Fix a subscribe page if has querystring
Remove constraints
Merge remote-tracking branch 'fujimura/update-deprecated-factory-girl-syntax'

Conflicts:
	Gemfile.lock

Regenerate Gemfile.lock to resolve conflict.
s/Factory/FactoryGirl.create/

See also: a955c2235b3cb3f3da4a08444d6b9560b73b6df7
Fix ApplicationController#url_from_path

ref: https://github.com/fastladder/fastladder/pull/93#issuecomment-15038989
Fix endpoint url on user controller spec.
Merge pull request #79 from fastladder/rpc_controller_update_feed_spec

Add test for RpcController#update_feed (and tiny bugfix)
Merge pull request #94 from aerith/fix-user-spec-endpoint

Fix endpoint url on user controller spec.
s/Factory/FactoryGirl.create/

See also 700162c3b6a45c8644a01e70a50def1821351505
Merge pull request #93 from ykzts/fix/subscribe-url-querystring

Fix a subscribe page if has querystring
Fix fetch body from RSS 2.0
Merge pull request #95 from ykzts/fix/fetch-body-rss-2

Fix fetch body from RSS 2.0