Remove graph.
DOC: change badge to 0.10.
BUGFIX: undefined var
BUGFIX: cmat addition.
Add import new_pz().
BUGFIX: typo in new_pz().
MINOR: access singularities as attributes
BUGFIX: typo, add defaults for new_pz()
BUGFIX: always check for the source.
Sort zeros.
MINOR: Remove spurious print statement
Temporary Work-around for Sympy issue 7584.