Add default ajax handler to IProc.

1. add default ajax handler to IProc.
2. delete seelog.xml for default logger system.
3. add a handy function for create user custom logger by giving a config
file.
Fix ajax method fallback problem.
Fix a bug in router module.

1. fix a bug which will cause empty route in router module.
2. add a test case to test the fixed bug above.
3. separate __Meta__ data in proc.RenderData to __Site__ and __Routes__.
4. redesign the tplcache module, support parsing other template folders.
5. TODO: the tplcache module need fix many things!!!
Redesign tplcache working procedure.

1. tplcache's methods will not return errors, they are now gathered in
tplcache.Err object.
2. modify api of using a customized not found proc.
Merge branch 'dev'