add : model file
add : database config
add : bootstrap class
change initialize context
Revert "change initialize context"

This reverts commit d63a8134f11a6f70b61be5196837bc886240ce05.
cached_property
add : bootstrap database
fix : load config files
add : python mysql driver
add : migration file
set database setting
Merge pull request #3 from teitei-tk/140824_base_model

140824 base model