Use latin-1 encoding when converting hmac secret to bytes
Use latin-1 encoding when converting hmac secret to bytes

* wqflask/utility/hmac.py (hmac_creation): Use latin-1 when
serializing the hmac secret. This ensures that the behaviour
of *verify_cookie* remains the same as in the python2 tip.

pjotrp/genenetwork2,zsloan/genenetwork2,pjotrp/genenetwork2,pjotrp/genenetwork2,zsloan/genenetwork2,genenetwork/genenetwork2,pjotrp/genenetwork2,zsloan/genenetwork2,genenetwork/genenetwork2,zsloan/genenetwork2,genenetwork/genenetwork2,genenetwork/genenetwork2,pjotrp/genenetwork2