fix util to_str check v as iterable error when v is dict

1.add command tool turbo-admin

2.complete some docs about turbo
3.fix demo

fix issue:20

add turbo session support

add turbo unit test

release 0.3.2 fix some bugs, add method required params

model add create_model to dynamic instance model

fix turbo/model.py", line 30, in wrapper: TypeError: 'collections.def…

…aultdict' object is not callable

release 0.2.9

发布 0.2.8

fix register module register spell error