unset hadoop env vars before local run/illustrate
moved unset_hadoop_env_vars to local::pig, call it in run_pig_command
forgot to remove unset_hadoop_env_vars calls in run/illustrate (since it's now in run_pig_command)
fix typo in HADOOP_CONF_DIF
Merge pull request #74 from mortardata/jpacker_unset_hadoop_env_vars

unset hadoop env vars before local run/illustrate