Substituted the use of initializer list for std::array in FemIntegration test.
Merge pull request #229 from endJunction/RegularShapeGaussQuadr

Regular shape Gauss quadrature
add TemplateIsoparametric
define FeQUAD4
add tests of FeQUAD4 with Eigen
[NL] Update from samplingLevel to integrationOrder.