dry up and modularize layouts
add header to sign up page
Show timestamp when hovering on comment time-ago string. Closes #4042
Merge pull request #4046 from embs/feature/4042-show-timestamp-on-comment-hover

Show timestamp when hovering on comment time-ago string. Closes #4042
Merge pull request #3944 from MrZYX/modular_layouts

Modular layouts
zsh doesn't find custom source files otherwise ... [ci skip]
Set max-age header to Amazon S3 resources
Remove duplicate sentence from delete account confirmation pop up
Merge pull request #4051 from Flaburgan/clean-delete-validation

Remove duplicate sentence from delete account confirmation pop up
If post has photos, always include url in post to Facebook to stay consistant with other servies, fixes #3706
Merge pull request #4052 from jaywink/3706-facebook-missing-link

If post has photos, always include url in post to Facebook
Merge pull request #4048 from marpo60/s3_max_age

Set max-age header to Amazon S3 resources