Unreviewed. Update NEWS and Versions.m4 for 2.2.1 release.

.:

* Source/autotools/Versions.m4: Bump version numbers.

Source/WebKit/gtk:

* NEWS: Add release notes.

git-svn-id: http://svn.webkit.org/repository/webkit/releases/WebKitGTK/webkit-2.2@157507 268f45cc-cd09-0410-ab3c-d52691b4dbfc
debian: bump to 2.2.1-1co1
Replace findstring with filter

Based on Michael Biebl <biebl@debian.org> patch