(Bug 5073) Upgrade to Foundation 5.1
(bug 5292) Refactor ESN Reply migration code
(Bug 5073) Remove redundant div#account-links from celerity

(It's already in the accountlinks block)
Merge pull request #633 from afuna/celerity-accountlinks-bug5073

(Bug 5073) Remove redundant div#account-links from celerity
(Bug 5073) Set body line height to 150%

Post-update tweaks to Foundation 5.1
Merge pull request #636 from afuna/foundation-5.1-bug5073

Update to Foundation 5.1
(Bug 5073) Use $background-color instead of $body-bg

$body-bg can contain images, etc, so we can't use darken with this. So
just use $background-color which only contains a color.

Also add this variable to Lynx, which doesn't currently have it (was
using the default before)
Merge pull request #637 from afuna/background-color-bug5073

(Bug 5073) Use $background-color instead of $body-bg
(Bug 5073) Minor fixes

* Remove extra div from /dev/style-guide

* Remove reference to obsolete stylesheet (404)
Merge pull request #638 from afuna/postconversion-misc-fixes-bug5073

(Bug 5073) Minor fixes
(bug 5292) Add comment
Merge pull request #635 from anall/feature/bug5292

(bug 5292) Refactor ESN Reply migration code