Merge pull request #152 from petricek/bstypo

cosmetic fix: warning message and comment
Merge pull request #153 from petricek/cleanup

some more cleanup
modify weighted average to work with norms properly
Zero the ngram and skip arrays before use
Merge pull request #154 from martinthomas/master

Zero the ngram and skip arrays before use
Output a warning when binary and raw options are both specified
Merge pull request #155 from martinthomas/master

Output a warning when binary and raw options are both specified