Merge pull request #54 from andlaus/use-opm-material

Use the new opm material module

A practical fall-out from merging this change is that GCC 4.4 becomes 
the minimum supported target platform for OPM-Porsol and its downstream
modules such as OPM-Upscaling.
Pure whitespace change: Converted [TAB] -> Space
Changed extension .FEGRID -> .EGRID
Changed call to saveEGRID() to pass global cell information
Merge pull request #59 from joakim-hove/save-eclgrid-after-deactivating-cells

Save eclgrid after deactivating cells
check for the C++-2011 'auto' keyword.

It seems like the corresponding FindCXX11Features.cmake file
was not updated for this module.
make the c++-2011 feature set of GCC 4.4 mandatory

we now produce an error even if the module in question does not
actually use some of these features.
replace Dune and boost classes by their C++-2011 equivalents

that is, provided that they are available in GCC 4.4. This basically boils
down to Dune::array and boost::array.