JSON CIG: Now escaping object and array keys

Previously scalar values were being escaped properly, but not array
and object keys. This commit fixes that.
Merge branch 'master' of github.com:NagiosEnterprises/nagioscore

* 'master' of github.com:NagiosEnterprises/nagioscore:
  Prep for 4.0.8 release.
  Changelog for runcmd fixes.