Add select_imme function

add select_course/select_imme.py
fix select_course/__init__.py
fix main_select.py
Fix select_imme.py

fix selct_course/select_imme.py
    fix select_del function
    add selct_del_old function

fix main_select.py
add select_last function

add select_course/select_last.py
fix main_select.py
fix select_course/__init__.py

minor fix select_course/select_imme.py
Update .gitignore

Add new rule
config
*.html
*.json
Add http_tool.py

add common/http_tool.py
    copy function print_response() res_body_output() to common/http_tool.py

fix common/account.py
    remove debug code
Add modules directory

move non-executable modules to 'modules' directory
move common/init.py to init.py
modify main_*.py
    fix import statement