added conductivity tensor instead of scalar conductivity
added some documentation to ElectrocardioConductivity
fixed typo in ElectroCardioConductivity parameter definition
adapted all Electrocardio examples to current parameter definitions
Merge pull request #4 from dasmy/conductivity_tensor

Made ElectroCardioConductivity a tensorial measure
Merge branch 'master' into rotated

Conflicts:
	include/materials/TensorHelpers.h
	testruns/B-Diffusion.i