will delete this, need it to delete older commit.... source tree is so stupid...
Revert "will delete this, need it to delete older commit.... source tree is so stupid..."

This reverts commit 494aed146a9b850aa0fddb73d31d509b79155283.
Revert "adding servlet api to WEB-INF\lib folder"

This reverts commit e40187f637fb046d3aa96376edda46a9a06f2a72.