Version 2 (released 2012-03-02):
* Fixed the sign of IEEE doubles in the PGF importing code. (Those doubles are
  not used yet, but potential future changes making use of them would have
  exposed the latent bug.)
* Fixed a PMCFG parsing bug which made some sentences in the GF Phrasebook
  example fail to parse: The match operation was merging type 0 stack items even
  when their PMCFG scopes were different, which is not allowed. Now type 0 stack
  items can only be reused when they have null scopes.

Version 1 (released 2012-01-30):
* Initial release.