added logarithmic axes

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

.../main/java/com/xeiam/xchart/demo/charts/ExampleChart.java

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

...ain/java/com/xeiam/xchart/demo/charts/bar/BarChart01.java

...n/java/com/xeiam/xchart/demo/charts/date/DateChart01.java

...n/java/com/xeiam/xchart/demo/charts/date/DateChart02.java

...n/java/com/xeiam/xchart/demo/charts/date/DateChart03.java

...n/java/com/xeiam/xchart/demo/charts/date/DateChart04.java

...n/java/com/xeiam/xchart/demo/charts/date/DateChart05.java

...n/java/com/xeiam/xchart/demo/charts/date/DateChart06.java

...n/java/com/xeiam/xchart/demo/charts/date/DateChart07.java

...n/java/com/xeiam/xchart/demo/charts/line/LineChart01.java

...n/java/com/xeiam/xchart/demo/charts/line/LineChart02.java

...n/java/com/xeiam/xchart/demo/charts/line/LineChart03.java

...n/java/com/xeiam/xchart/demo/charts/line/LineChart05.java

...n/java/com/xeiam/xchart/demo/charts/line/LineChart06.java

...n/java/com/xeiam/xchart/demo/charts/line/LineChart07.java

...n/java/com/xeiam/xchart/demo/charts/line/LineChart08.java

...n/java/com/xeiam/xchart/demo/charts/line/LineChart09.java

...n/java/com/xeiam/xchart/demo/charts/line/LineChart10.java