bug fixes - taxis ticks could not be hidden, plot area width was falsely calculated.

...n/java/com/xeiam/xchart/demo/charts/area/AreaChart01.java

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

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

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

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

...a/com/xeiam/xchart/internal/chartpart/AxisTickLabels.java

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

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

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

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

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

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