made format mandatory for integer and numeric types, added query parameter schema, samples

The parameter samples have just begun but some notable work:
* For query, path and possibly others, we are introducing an `array` type with mandatory `format`.  This will help address issues like such:

https://github.com/wordnik/swagger-ui/issues/118

https://github.com/wordnik/swagger-spec/issues/49

There is certainly not a comprehensive format list yet, but this will be updated.

* integer and numeric types *must* have a compatible format specifier