Add regexp classes \k and \K to Daijirin/EDICT
Add help for \k,\K classes to Daijirin/EDICT
Add version check for daijirin.marshal

This is necessary ever since @hash[:all] addition.
Fix handling of && in regexp character classes
Use posix-spawn gem to avoid faulty fork in Mecab
Adapt to replaced gaiji format in Daijirin
Strip formerly-gaiji formatting symbol in Daijirin
Add .about command to Statistics
Reinstate limited regexp search in EDICT
Reinstate limited regexp search in Daijirin
Default to full regexp search in Daijirin/EDICT