#45 JsonNumber not correctly identifying decimal numbers with exponent

[Oran Kelly]

JsonNumber.isDecimal detects a decimal number by seeing if the input contains a '.'

This misses a number whose input is of the form "7E-5" - a valid exponent-formatted number but containing no decimal point. flexjson then tries to parse this using Long.parseLong when deserializing and throws a NumberFormatException.