Added another null check to Lockables to allow (for now) lockables to be read_locked/unlocked with job_key == null;
Merge branch 'master' of github.com:0xdata/h2o
Updated parse to:
  a) and better error message in json in case of invalid parser setup
  b) allow for user to go through(if possible) with his selected setup even though h2o thinks it's invalid.
Merge branch 'master' of github.com:0xdata/h2o