Remove duplication from Experiment#save
Remove duplication from Experiment#save

Extract common code from Experiment#save in Expriment#save_goals,
Experiment#save_metadata methods in order to remove duplication.

splitrb/split,ccallebs/split,craigmcnamara/split,ccallebs/split,splitrb/split,craigmcnamara/split,ccallebs/split,craigmcnamara/split,splitrb/split