Fixes #5041 - check if procfs is mounted
Load plugin fixtures in SetupFixture command.
Fixing build.
Updating UI submodule (fixing build).
Merge branch 'master' of https://github.com/piwik/piwik
Fixes #5041 - ditch negative semantic, that's more readable
Remove one spam entry from PR #264
Removing extra link in hindi credit
Removing keyword links to favor links on translator names. See: http://piwik.org/translations/
code simplification : API::getInstance()->getSitesWithAdminAccess() returns all sites if user has super user access
Setting the default timezone to UTC in the core:archive script, refs #5043
This could potentially cause some big problems.
Fixes #2268 Implement a default Referrer spam blacklist to block semalt.com spammer. (can be extended to other spammers on request!)

; All Visits with a Referrer URL host set to one of these will be excluded.
; If you find new spam entries in Referrers>Websites, please report them here: http://dev.piwik.org/trac/ticket/2268
; List of known Referrer Spammers, ie. bot visits that set a fake Referrer field:
referrer_urls_spam = "semalt.com"