Add pfasst-quadrature.hpp and appropriate tests.
adding first draft of Doxygen configuration

also extended gitignore
first draft of the coding style guide for PFASST
Merge pull request #1 from torbjoernk/feature/doxygen

adding first draft of Doxygen configuration
Merge pull request #2 from torbjoernk/feature/style-guide

first draft of the coding style guide for PFASST