重构fts，添加fts/features测试
bdd before_all添加fixture_dir
将submodule更换为源码库
将dependents/django-behave submodule更换为源码库，修改travis-ci支持bdd
Merge branch 'feature/behaving' of https://github.com/killuavx/game_center into feature/behaving
2to3 splinter to support python3
test serializer with HyperlinkedIdentityField using fts.middleware.get_current_request
添加account的bdd测试: sign up/in/out
Merge branch 'feature/behaving' into develop #10
acount BDD测试