Add loading indicator on tag pages, remove the second one from the profile page
Fix login for short passwords
never pass nil to image_tag

In production that results in a not precompiled error
Update robots.txt comments

clarify comments and update permanently moved URL
Merge pull request #4222 from rivendale2010/patch-1

Update robots.txt comments
Merge pull request #4221 from svbergerem/4123-fix-login-short-password

Fix login for short passwords
Merge pull request #4217 from svbergerem/4041-loading-indicator

Add loading indicator on tag pages, remove second one from profile page

Conflicts:
	Changelog.md
Check for nil before splitting contact_ids param.
#4180 was placed in the wrong milestone
Merge pull request #4230 from Flaburgan/patch-1

#4180 was placed in the wrong milestone
Merge pull request #4229 from davexunit/4227-private-message-error

Check for nil before splitting contact_ids param in ConversationsController
tweak readme [ci skip]

* Drop remaining links to the Github wiki
* Redirect Mailing list links through the wiki
* Update links that are redirects
* enable syntaxhighlighting
update all wiki links