Issue #130 - allow bars to touch bottom at the X-Axis.

...va/org/knowm/xchart/demo/charts/area/AreaLineChart03.java

...ain/java/org/knowm/xchart/demo/charts/bar/BarChart01.java

...n/java/org/knowm/xchart/demo/charts/line/LineChart03.java

...n/java/org/knowm/xchart/demo/charts/line/LineChart07.java

...ain/java/org/knowm/xchart/demo/charts/pie/PieChart03.java

xchart/src/main/java/org/knowm/xchart/Styler_Pie.java

...c/main/java/org/knowm/xchart/internal/chartpart/Axis.java

...chart/internal/chartpart/AxisTickCalculator_Category.java

...wm/xchart/internal/chartpart/AxisTickCalculator_Date.java

...rt/internal/chartpart/AxisTickCalculator_Logarithmic.java

.../xchart/internal/chartpart/AxisTickCalculator_Number.java

...m/xchart/internal/chartpart/PlotContent_Category_Bar.java

...nal/chartpart/PlotContent_Category_Line_Area_Scatter.java

.../org/knowm/xchart/internal/chartpart/PlotContent_Pie.java

...a/org/knowm/xchart/internal/chartpart/PlotContent_XY.java

...a/org/knowm/xchart/internal/chartpart/Plot_AxesChart.java

...src/main/java/org/knowm/xchart/internal/style/Styler.java

...ava/org/knowm/xchart/internal/style/Styler_AxesChart.java

...src/main/java/org/knowm/xchart/internal/style/Theme_.java

...n/java/org/knowm/xchart/internal/style/Theme_GGPlot2.java