moved all formatting code to a ValueFormatter class.

.../src/main/java/com/xeiam/xchart/demo/charts/Example1.java

...src/main/java/com/xeiam/xchart/demo/charts/Example10.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/Example4.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/Example9.java

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

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

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

...c/main/java/com/xeiam/xchart/internal/chartpart/Axis.java

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

...va/com/xeiam/xchart/internal/chartpart/AxisTickMarks.java

...n/java/com/xeiam/xchart/internal/chartpart/AxisTitle.java

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

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

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

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