Merge branch 'develop'

.gitignore

.travis.yml

README.md

pom.xml

xchart-demo/pom.xml

...ain/java/com/xeiam/xchart/demo/charts/bar/BarChart04.java

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

.../src/main/java/com/xeiam/xchart/standalone/SwingDemo.java

xchart/pom.xml

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

xchart/src/main/java/com/xeiam/xchart/internal/Utils.java

...xchart/internal/chartpart/AxisTickBarChartCalculator.java

...iam/xchart/internal/chartpart/AxisTickDateCalculator.java

...art/internal/chartpart/AxisTickLogarithmicCalculator.java

...chart/internal/chartpart/AxisTickNumericalCalculator.java

.../xeiam/xchart/internal/chartpart/PlotContentBarChart.java

...xeiam/xchart/internal/chartpart/PlotContentLineChart.java