Format checking for waterdata api inputs

[ehinman]

Taken from #183 (comment)

Consider adding in more sophisticated type checking for waterdata api inputs. For example, someone could enter "dog" or 12345 as a monitoring location id and the service will make the call. This is inefficient when API rate limits are now imposed and we don't want users confused about why their data call returns no data.

Examples:

`check, md = waterdata.get_daily(
monitoring_location_id=5129115,
parameter_code="00060"
)

check, md = waterdata.get_daily(
monitoring_location_id="dog",
parameter_code="00060"
)`