Merge branch 'develop'

* kernelDensity
  Added kernelDensity function.

* boxPlot:
  Added ‘violin’ methods and properties for making violin plots.
  Added various violin-related options. Also modified the scatter offset to use kernel density rather than histogram. Fixed outlier bug that wasn’t merged from master.
  Added themeColor property, allowing the various colours for the theme to be changed via a single property.

* calcSnr
  Prevent rank deficient warning when output is zeros.

Author: Christopher Hummersone

+iosr/+bss/calcSnr.m

@@ -39,9 +39,11 @@
     end
 
     % account for arbitrary gain
-    G = output\target;
-    output = output.*G;
-
+    if sum(abs(output(:))) > 0
+        G = output\target;
+        output = output.*G;
+    end
+    
     snr = 10*log10(sum(target.^2)/sum((output-target).^2));
 
 end