FLUID-5131: composite panel grade plus fixes for FLUID-5170, FLUID-5181, FLUID-5182, and FLUID-5187

Adds in the compositePanel grade which is useful for combining individual panels into a single panel.
http://issues.fluidproject.org/browse/FLUID-5131

Also includes fixes for the following jiras.
http://issues.fluidproject.org/browse/FLUID-5170,
http://issues.fluidproject.org/browse/FLUID-5181,
http://issues.fluidproject.org/browse/FLUID-5182,
http://issues.fluidproject.org/browse/FLUID-5187