fix (n=#) in violinplot
Merge branch 'hotfix/violinplot_numbers'

* hotfix/violinplot_numbers:
  fix (n=#) in violinplot
  test passing??
  test Study.save() works!!!
  fixing up datapackage stuf
  add more datapackage attributes to reading the datapackage
  Add option to not load species data
  add all datapackage parameters to study object
  remove pooled samples from data
  remove pdb/set_trace()
  mapped_reads --> number_mapped
  initial commit of properly saving datapackages