cleanup of README

README.md

@@ -11,11 +11,14 @@ Installation
 
 Building the module follows the standard Dune guideline, i.e. simply call
 
-  dunecontrol --current all
+```
+dunecontrol --current all
+```
 
 In the modules root directory. Required dependencies are the modules
 - dune-common
 - dune-grid
+
 and optionally you may provide different grid modules that can be used with
 dune-multimesh, e.g.
 - dune-alugrid
@@ -28,14 +31,18 @@ Getting started
 In order to build a MultiMesh, simply wrap your host-grid type into a the
 `MultiMesh` class and set the number of grids to construct.
 
-  using HostGrid = ALUGrid<2, 2, simplex, conforming>;
-  MultiMesh<HostGrid> multimesh(2);
+```
+using HostGrid = ALUGrid<2, 2, simplex, conforming>;
+MultiMesh<HostGrid> multimesh(2);
+```
 
 If the host-grid allows to pass arguments to its constructo, these can be
 appended to the MultiMesh constructor after the size argument, e.g.
 
-  using HostGrid = AlbertaGrid<3,3>;
-  MultiMesh<HostGrid> multimesh(2, filename);
+```
+using HostGrid = AlbertaGrid<3,3>;
+MultiMesh<HostGrid> multimesh(2, filename);
+```
 
 Since grids are not copy-constructable, all grids in a MultiMesh are constructed
 from scratch from the same arguments or the same grid-factory, to guarantee
@@ -46,10 +53,12 @@ constructor creates one grid only. (This is just to be conform the the
 GridFactory interface). In order to use, e.g. structured grid-factory builders,
 you have to pass the MultiMesh GridFactory:
 
-  using HostGrid = ALUGrid<2, 2, simplex, conforming>;
-  using Factory = StructuredGridBuilder<MultiMesh<HostGrid> >;
-  GridFactory<MultiMesh<HostGrid> > gridFactory(3); // create 3 grids
-  auto gridPtr = Factory::createSimplexGrid(gridFactory, lower, upper, num);
+```
+using HostGrid = ALUGrid<2, 2, simplex, conforming>;
+using Factory = StructuredGridBuilder<MultiMesh<HostGrid> >;
+GridFactory<MultiMesh<HostGrid> > gridFactory(3); // create 3 grids
+auto gridPtr = Factory::createSimplexGrid(gridFactory, lower, upper, num);
+```
 
 Since the dune-grid StructuredGridFactory does not allow to pass an own
 GridFactory object to fill, a modified StructuredGridFactory is provided in the