update helper script
加入个性化推荐的分支选项
Merge branch 'master' into litao
update=
update sql code
corrected wrong spelling of "false" from "flase"
update
Merge branch 'litao'
update
add highlight, no test
an ok version of highlighting
add new references and my notes to references/
get subset for word cloud
update readme for presentation
Merge branch 'litao'
update
update
get_distance_rank complete, but no test
no bug version, but not rerank
an ok version, nrow needs to be updated