Require refinery/pages/url when it's used, not in the spec.
Merge pull request #2420 from refinery/2-1-thread-safety

2 1 thread safety
- Fix missing spanish translation keys.
Merge pull request #2425 from jatap/feature-pages-locale-es

- Fix missing translations in spanish for pages.
WIP. Improving Menu Presenter guide. [ci skip]
Update 1 - Menu Presenter.textile
misprint
Merge pull request #2441 from lipina/patch-1

misprint in guides
Add the migration step to these instructions
Merge pull request #2443 from anitagraham/patch-1

Add the migration step to these instructions
Merge branch '2-1-stable' of https://github.com/refinery/refinerycms into 2-1-stable