v0.3.2

• Patch addressing inexpected behaviour of erase argument in
  preprocess() and get_kgram_freqs_fast(), c.f. issue #17.

sbo 0.3.1

• Changed leading to trailing underscore in private variables definition of C++ kgramFreqs class, as per §1.6.4 of the "Writing R extensions" guide.
• Removed Catch tests infrastructure for C++ code.