Add test case for unicode user_id in cookies
Add test case for unicode user_id in cookies

This test cases fail with 0.3.0 of flask-login.
Handling unicode user_id's worked except for storing in cookies in the past.

r2dev/flask-login,wuxiangfeng/flask-login,miguelgrinberg/flask-login,phantomxc/flask-login,livepy/flask-login,felixonmars/flask-login,nfvs/flask-login,wuxiangfeng/flask-login,nfvs/flask-login,wangjun/flask-login,livepy/flask-login,alanhamlett/flask-login,HoustonFortney/flask-login,wangjun/flask-login,neilsh/flask-login,eeue56/flask-login,skion/flask-login,GregoryVigoTorres/flask-login,felixonmars/flask-login,phantomxc/flask-login,r2dev/flask-login,neilsh/flask-login,HoustonFortney/flask-login,SantjagoCorkez/flask-login,skion/flask-login,eeue56/flask-login,maxcountryman/flask-login,miguelgrinberg/flask-login,quokkaproject/flask-login,Pastafarianist/flask-login,GregoryVigoTorres/flask-login,quokkaproject/flask-login,SantjagoCorkez/flask-login,Pastafarianist/flask-login