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Add Spectrum chart.
Merge remote-tracking branch 'origin/branch-0.3.0'

Conflicts:
	pom.xml
	src/main/java/org/azkfw/chart/charts/polar/PolarPlot.java
	src/main/java/org/azkfw/chart/charts/polararea/PolarAreaLooks.java
	src/main/java/org/azkfw/chart/charts/polararea/PolarAreaPlot.java
	src/main/java/org/azkfw/chart/plot/AbstractPlot.java
Release ver 0.3.1