Tightened up ValidationOptions

Using a combination of the source code and the documentation at
http://jqueryvalidation.org/validate/ I've tightened up the
ValidationOptions.  NB success remains as any because (AFAIK) it's not
possible to model alternate overloads in an interface with TypeScript (
https://typescript.codeplex.com/workitem/1893 ).
Merge pull request #1270 from johnnyreilly/master

jQuery Validation: Tightened up ValidationOptions