got rid of static chart style classes

xchart-core/src/main/java/com/xeiam/xchart/Chart.java

xchart-core/src/main/java/com/xeiam/xchart/Series.java

xchart-core/src/main/java/com/xeiam/xchart/SeriesColor.java

...-core/src/main/java/com/xeiam/xchart/SeriesLineStyle.java

xchart-core/src/main/java/com/xeiam/xchart/SeriesMarker.java

...in/java/com/xeiam/xchart/internal/chartpart/AxisPair.java

...in/java/com/xeiam/xchart/internal/chartpart/AxisTick.java

...java/com/xeiam/xchart/internal/chartpart/PlotContent.java

...eiam/xchart/internal/misc/SeriesColorMarkerLineStyle.java

...chart/internal/misc/SeriesColorMarkerLineStyleCycler.java

...mples/src/main/java/com/xeiam/xchart/demo/XChartDemo.java

.../src/main/java/com/xeiam/xchart/demo/charts/Example2.java

.../src/main/java/com/xeiam/xchart/demo/charts/Example3.java

.../src/main/java/com/xeiam/xchart/demo/charts/Example5.java

.../src/main/java/com/xeiam/xchart/demo/charts/Example6.java

.../src/main/java/com/xeiam/xchart/demo/charts/Example7.java

.../src/main/java/com/xeiam/xchart/demo/charts/Example8.java

...ples/src/main/java/com/xeiam/xchart/example/Example1.java