Fix Array Out of bounds exception for JSONFormatter when before hook is present 

The release of 1.1.3 showed a flaw in the JSONFormatter. The flaw was that we are always trying to add hooks to a scenario when in fact a before hook can be run before a scenario is known to the JSONFormatter. 

This pull request fixes that issue by storing the before hooks until we have a scenario to add them to. In the process it broke the JSON parser so I adjusted to code to ensure all current tests pass. 

This will fix the issue in cucumber JVM... 
https://github.com/cucumber/cucumber-jvm/issues/476

It will also allow the following test to pass...
https://github.com/cucumber/cucumber-jvm/pull/478