+ add purge feature, making cache purging possible, signal: purge
* fixed response in inappropriate format which should be using text/xml
* improved start script

Signed-off-by: tesseract2048 <hty0807@gmail.com>
+ db wrapper
+ portal module (for auth etc.), including auth and auth_ok tpl
+ auth service
* restored etju helper
* fixed: error dump may send headers twice leads to crash
* improved start script

Signed-off-by: tesseract2048 <hty0807@gmail.com>