rewrite readme [ci skip]
update devise to 2.2.4
bump devise to 3.0.2
Merge pull request #4341 from MrZYX/readme_rewrite

Proposal: new readme
Remove photo backdrop in single post view.
Fix specs for TemplatePicker
mobile error 500 if a reshared (original) post will be deleted.
Merge pull request #4407 from rogerbraun/feature/spv-photo-background-removal

SPV photo background removal,
Merge pull request #4398 from movilla/deleted_reshared_mobile

Mobile Error 500 if a reshared (original) post will be deleted.

Conflicts:
	Changelog.md
Remove post from the mobile site
Merge pull request #4408 from movilla/reremove_post

Remove post from the mobile site
Merge pull request #4371 from MrZYX/bump_devise

Update devise
add help page
change help to faq