update license to Apache 2.0
use new Row api
refactor unit tests to extend BaseTest
Add Row2Rating conversion, ALSTest passed
update ddf version
comment out unused script
add method na.omit()
FiveNum and VectorQuantiles don't work, comment out the testcases
Update ddf.R

change the parameter representation in Method na.omit()
Update ddf.R

undate
Update

update
Update ddf.R
Update ddf.R
Update ddf.R
Merge pull request #43 from ljzzju/na.omit

add method na.omit()
Merge branch 'master' into ddf-sparksql-1.1.0

Conflicts:
	pom.xml
Merge pull request #26 from ddf-project/ddf-sparksql-1.1.0

DDF implementation on SparkSQL
fixes #33
Merge branch 'master' of https://github.com/ddf-project/DDF
dont exclude netty