add release notes
temporarily disable S4 build
Merge pull request #100 from gdfm/release_notes

add release notes
Merge pull request #101 from gdfm/disableS4

temporarily disable S4 build
add javadoc plugin
Merge pull request #97 from gdfm/javadoc

add javadoc plugin
Revert "Counting zeros"
Merge pull request #103 from yahoo/revert-98-counting-zeros

Revert "Counting zeros" temporarily
disable deploy for PR
Merge pull request #104 from gdfm/travis-pr

disable deploy for PR
Revert "Revert "Counting zeros""
Merge pull request #106 from yahoo/revert-103-revert-98-counting-zeros

Revert "Revert "Counting zeros""
allow to export model of Naive Bayes classifier

Checking for non-null estimators before acting upon it

Signed-off-by: Olivier Van Laere <vanlaere@yahoo-inc.com>
Fixing variance extraction for exact estimator reconstruction

Signed-off-by: Olivier Van Laere <vanlaere@yahoo-inc.com>