Use minimum and maximum value of an integer property to determine java type long

[benjefferies]

Use the minimum and maximum properties as a hint to the java type of an integer.

Given the simple json object below we can infer that the type will be a long because the minimum value is to small.

{
  "type" : "object",
  "properties" : {
    "longProperty" : {
      "type" : "integer",
      "minimum": -2147483649
    }
  }
}

resolves #375

[joelittlejohn]

Excellent, thanks. Are we missing a json file here?

[benjefferies]

No worries, just added it now as it was missed from previous commit. Guess CI can be kicked off again now.

[joelittlejohn]

A very thorough change, thanks! Could you squash these two commits into one please and I'll merge.

[benjefferies]

@joelittlejohn I have squashed into one commit and CI is green. Ready for you to merge when you're ready

[joelittlejohn]

Brilliant, thanks!!