FIX: css change broke build
Merge pull request #2870 from techAPJ/patch-2

FIX: css change broke build
remove admin-loading in favor of spinner css
remove editor preview css styles from mobile
move editor spinner css to shared (base) css
width 100% for editor on mobile; no preview

also  remove box-sizing mixin, use native CSS3
min-width of 1280px for editor on mobile??

OH HELLllll TO THE NO
minor mobile editor tweaks
few more mobile editor tweaks
oops
add better mobile inline title edit styles
hacky override of inline select2 width in editor
*Don't* silence the deprecation warnings in test

This is actually where we are most likely to see it (and we should try to deal
with those as soon as possible, ideally when upgrading).
FIX: honor `email_token_grace_period_hours` setting correctly

The documentation said that the unit for this setting is in *hours*, but the
code is treating it as *seconds*. Also, `Numeric#ago` has been deprecated since
Rails 4.1 (precisely to help prevent these kind of bugs) and will go away in
Rails 4.2.