import Fedor's contribution
TEST: add unittest and check with travis
DOC: update return according to wu's method
TEST: fix returned tuple
TEST: fix unittest
DOC: fix refs
MAINT: put AA method in draw.*_aa
DOC: remove wu in methods
Implement line_aa
Anti-aliasing
MAINT: bezier_segment is private
MAINT: val in [0,1]
DOC: split non-AA/AA
FIX: division for value
PEP8
PEP8
ADD: bezier_curve
DOC: add bezier_curve
MINOR: doctrings + various improvements
FIX: broken test (thanks unittest!)