update helper script
加入个性化推荐的分支选项
Merge branch 'master' into litao
update=
update sql code
Merge pull request #14 from zerolocker/gh-pages

试一下pull-requests
corrected wrong spelling of "false" from "flase"
update
Merge branch 'litao'
update
add highlight, no test
an ok version of highlighting
add word clouds of 4 different themes
merging
clean files
add new references and my notes to references/
get subset for word cloud
update readme for presentation
Merge branch 'litao'
update