updated tests to new configuration needed at end of processing
changed output array to be unindexed and added name param to output
changed outputkey to posts to match required format
added function to process the random item into the required format
added the ability to unset keys from the post and unset _id
moved key unsetting into its own function
added metric value setting
changed key unsetting to be based on specified keys to included to make it easier
remove key unsetting value alltogether to simplify
updated expected for left test and got it passing
set message in output and got tests passing
added image_url param to processed output and updated tests
added big_image_url param to processed output and updated tests