Update to Sage 8.7

[penguian]

In particular, after update to Sage 8.7, the test for boolean_cayley_graphs/strongly_regular_graph.py resulted in one failure:

sage -t boolean_cayley_graphs/strongly_regular_graph.py
**********************************************************************
File "boolean_cayley_graphs/strongly_regular_graph.py", line 64, in boolean_cayley_graphs.strongly_regular_graph.StronglyRegularGraph
Failed example:
    latex(srg)
Expected:
    \begin{tikzpicture}
    \definecolor{cv0}{rgb}{0.0,0.0,0.0}
    \definecolor{cfv0}{rgb}{1.0,1.0,1.0}
    \definecolor{clv0}{rgb}{0.0,0.0,0.0}
    ...
    \Vertex[style={minimum size=1.0cm,draw=cv61,fill=cfv61,text=clv61,shape=circle},LabelOut=false,L=\hbox{$61$},x=2.87cm,y=4.6843cm]{v61}
    \Vertex[style={minimum size=1.0cm,draw=cv62,fill=cfv62,text=clv62,shape=circle},LabelOut=false,L=\hbox{$62$},x=3.3104cm,y=3.6687cm]{v62}
    \Vertex[style={minimum size=1.0cm,draw=cv63,fill=cfv63,text=clv63,shape=circle},LabelOut=false,L=\hbox{$63$},x=3.9728cm,y=3.5058cm]{v63}
    %
    \Edge[lw=0.1cm,style={color=cv0v1,},](v0)(v1)
    \Edge[lw=0.1cm,style={color=cv0v2,},](v0)(v2)
    \Edge[lw=0.1cm,style={color=cv0v3,},](v0)(v3)
    ...
    \Edge[lw=0.1cm,style={color=cv58v63,},](v58)(v63)
    \Edge[lw=0.1cm,style={color=cv59v62,},](v59)(v62)
    \Edge[lw=0.1cm,style={color=cv60v61,},](v60)(v61)
    %
    \end{tikzpicture}
Got:
    \begin{tikzpicture}
    \definecolor{cv0}{rgb}{0.0,0.0,0.0}
    \definecolor{cfv0}{rgb}{1.0,1.0,1.0}
    \definecolor{clv0}{rgb}{0.0,0.0,0.0}
    \definecolor{cv1}{rgb}{0.0,0.0,0.0}
    \definecolor{cfv1}{rgb}{1.0,1.0,1.0}
    \definecolor{clv1}{rgb}{0.0,0.0,0.0}
    \definecolor{cv2}{rgb}{0.0,0.0,0.0}
    \definecolor{cfv2}{rgb}{1.0,1.0,1.0}
    \definecolor{clv2}{rgb}{0.0,0.0,0.0}
...