merge extractor code from team's server
Revert "merge extractor code from team's server"

This reverts commit cf3ca1be18580c5ff6c9ef74685f2b9430b3963f.
merge extractor from server
merge from team server
merge Extractor from team server
merge Extractor from team's server
merge Extractor from team's server
merge Extractor from team's server
merge loader
merge loader
added new changes from Xiao's code
fix dbhandler.java
fix DBhandler.java
Fix export2db
Merge pull request #30 from ankel/master

Demo code
Merge remote-tracking branch 'upstream/master'