New tree iterator and printout method
Merge pull request #20 from rafacarrascosa/develop

New iterator and printout method
Simplified problem attributes api
-precision goes to machine_learning api
-correct exception given in precision
First version of language classification sample
Merge pull request #21 from rafacarrascosa/develop

Machine learning: Making a sample and fixing the api so it's easier to use
Improved language classification example with naive bayes and a little doc
Bug in log probabilities (raw counts were being used instead)
Errrmmm, same as previous commit, sorry :S
Merge branch 'develop' of github.com:fisadev/simpleai into develop
Added example for opinion mining
Merge pull request #23 from rafacarrascosa/develop

Bug fix, improved sample, added feature
Added stopwords for the opinion example
Added Classifier to the api to allow load from pickled
Merge pull request #24 from j0hn/develop

Added opinion mining example
Now you can specify how states will be represented. This will be used on the interactive runner
Completed some docstrings
Merge pull request #25 from j0hn/develop

Completed some docstrings
Fixed bug in naivebayes (adding __len__ makes "if x:" work)
Unused variable