Merge branch 'stable-2.5' into stable-2.6

* stable-2.5:
  Release notes for 2.5.4
  Require preferred email to be a verified address
  Corrections in the 2.5.x release notes

Conflicts:
	ReleaseNotes/ReleaseNotes-2.5.2.txt
	gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/account/AccountSecurityImpl.java

Change-Id: I08731949f0e7a87604ca003b81e6dbe63678bd82