add ctr prediction example
Merge remote-tracking branch 'origin/master'
update ctr.md
add inspection
Update ctr.md
Update ctr.md
Update ctr.md
add getParam to Params
use stages param for pipeline stages
add spark-sql as dep
wrap lr
add a test (not working)
Merge remote-tracking branch 'upstream/master' into class-hierarchy

Conflicts:
	src/main/java/ml/algorithm/JavaLogisticRegression.java
	src/main/scala/ml/dataset/Dataset.scala
	src/main/scala/ml/example/LogisticRegression.scala