Feature request: ability to work with preprints/technical reports

[Hunter-Github]

@TechReport{Doe2015,
  author =   {John A. Doe},
  title =    {How to frobnify efficiently: lessons from the 10th International Frobnification Experiment},
  institution =  {Scripps Institution of Oceanography},
  year =     {2015},
  type =     {Working Paper},
  number =   {135/16},
  address =      {La Jolla, Calif.},
  month =    {December},
}

If I manually add the BibTeX record now, BMC won't recognize the record type.

[Phyks]

Indeed, that is something I do not use so I may have missed it not working. I keep it in my TODO list for the refactor #34.