* ais_shell.py ver.3.1.4

  - add arguments to the handler in functions 'lo_get()', 'log_by_index()' and 'log_by_time()'.Arguments are by default None,and are not required for the project itself 'ais_shell'

git-svn-id: svn://192.168.1.162/sw_open/ais_readers/python/examples/shell/trunk@61 0228885a-6ad7-41a9-bcf9-d0ec016d0fc8