(feature) Add json parse of gatling config

This commit adds the functionality to get all of the configuration set
in Jenkins, with the required numbers of # node instances and # of
repetitions.

Prior to this commit, our setup files needed a way to share the gatling
config parsed from json files. This commit adds a helper to accomplish
that.
(maint) Change gatling sim data file to csv

Prior to this commit, the gatling_sim_data file was being saved as a
.txt file. This commit changes it to be a csv file for easy parsing by
programs.
(maint) Remove node list caching

Prior to this commit, 01 config cached the node list, which caused
problems when installing PE on Jenkins jobs. This commit changes it so
it recaptures the node list every job run.

Also fixed a type where I meant == instead of =.
Merge pull request #59 from briancain/maint/master/add_json_parse

(feature) Add json parse of gatling config