add create method to base class
add app_create method
add header to create, so that we should expect json back
change content type parameter to take json symbol for rest-client
add switch, to hopefully prevent xml retrun
change call of RestClient.post to take a parameter for payload as blank, forces json return
fix post call to use the proper headers
create addon_create method
fix parameter typo in addon_create
add payload parameter, as some of our post requests will utilize them
addon_create now requires a plan_id that will be passed into the post request
use proper branch for merge, have to rollback if issues come up