Resolve "MultiElasticity should hold multiple MainElasticities"

Closes #213

Should be compiled and tested.

src/CardiacSolver.hpp

@@ -2,6 +2,7 @@
 #define CARDIACSOLVER_HPP
 
 #include <string>
+#include "Config.hpp"
 
 /// Default Wrapper for all solvers to provide verbose and vtk values
 class CardiacSolver {