Add query parameter validation

[mrodriguez3313]

Add checks to make sure we get a valid parameter values. That way we don't save or even import the key on a publish function. This will save time and not require backtracking work to delete potentially saved keys.

This is in reference to this function https://github.com/mrodriguez3313/IPNSGoServer/blob/1acc150aa82717528482b07d56da516faffcf9d1/server.go#L61

EDIT** Changed slightly to this now:

Fierro/src/utils.go

Line 53 in 88b80d9

func HasParam(r *http.Request, parameter string) (string, bool) {