add settings.py to specify application variables

[hl1]

example: https://github.com/django/django/blob/master/django/conf/project_template/project_name/settings.py-tpl

[hl1]

@yevgenybulochnik feel free to take a crack at this as well. my method is usually importing settings.py in all files and specify the variables that I want to use but there is got to be a better way to do this.