move marker size to style manager

README.md

...o/src/main/java/com/xeiam/xchart/standalone/Example0.java

xchart/src/main/java/com/xeiam/xchart/StyleManager.java

...main/java/com/xeiam/xchart/internal/chartpart/Legend.java

.../xeiam/xchart/internal/chartpart/PlotContentBarChart.java

...xeiam/xchart/internal/chartpart/PlotContentLineChart.java

...c/main/java/com/xeiam/xchart/internal/markers/Circle.java

.../main/java/com/xeiam/xchart/internal/markers/Diamond.java

...c/main/java/com/xeiam/xchart/internal/markers/Marker.java

...c/main/java/com/xeiam/xchart/internal/markers/Square.java

.../java/com/xeiam/xchart/internal/markers/TriangleDown.java

...in/java/com/xeiam/xchart/internal/markers/TriangleUp.java

...in/java/com/xeiam/xchart/internal/style/GGPlot2Theme.java

...ain/java/com/xeiam/xchart/internal/style/MatlabTheme.java

.../src/main/java/com/xeiam/xchart/internal/style/Theme.java

...ain/java/com/xeiam/xchart/internal/style/XChartTheme.java