Update examples.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5652 2fea6a4d-a838-0410-917b-93a53c48e9d2
LF.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5653 2fea6a4d-a838-0410-917b-93a53c48e9d2
Exception messages.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5654 2fea6a4d-a838-0410-917b-93a53c48e9d2
Introduces Textpattern_Filter_Callable.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5655 2fea6a4d-a838-0410-917b-93a53c48e9d2