Removed Grok paragraph.
Fixed link to pypi z3c validators.
Fixed z3c.form validator section link.
grok provider decorator replaced by zope directly provides interface.
Grok utitlity replaced by zcml utility directive.
Class based factory.
Mark xml code blocks as xml.
Explicit import and removed DisplayForm reference. Gardening and indentation.
Removed grok static dir paragraph. Renamed confusing 'resource' to 'static'.