there is non-ascii char in core/base.py line 119
there is a 3to2 modifying for compat in line 101~102
The class "Seq" should inherited "object" to be a new-style class in Python 2.x
Refix "__next__" and modify "yield from" to syntax of Python2.x

Close #1
Merge pull request #14 from Apua/develop

Fixing Python 2.x support