Change String a=null, b=null to String a, b =null
Merge pull request #25 from DoingDone9/master_issue_04

String a = null, b = null  can be instead of  String a, b = null
version is 1.0
update install.sh script
Merge pull request #27 from ddf-project/fix-ddfversion

DDF version is 1.0
add ddfKmeans method in ddf-R
through a bug in R func head()
change dataFrame to as.data
Now we can R CMD check package when standing at DDF/R directory
Now we can R CMD check package when standing at DDF/R directory
resolve conflicts after commit with amend option
update
update KMeans and as.data.frame
deleted unused files
Merge pull request #31 from ddf-project/nhan-add-test-all-for-R-CMD-check

Now we can R CMD check package when standing at DDF/R directory
add end line
Merge pull request #30 from ljzzju/fixHeadBug

Fix head bug
update license to Apache 2.0