JsonSlurper LAX parser with invalid number handling

[Pascal Schumacher]

Hello everybody,

any opinions on how the Json LAX parser should handle an invalid number?
a) fail parsing
b) parse it as string
c) fail on access

See: https://issues.apache.org/jira/browse/GROOVY-7630 and 
https://github.com/apache/incubator-groovy/pull/189 for details.

Thanks to John for all the work he put into this.

-Pascal