update normalize script
Merge pull request #374 from tamiko/update_normalize_script

update normalize script
add .gitattributes

we ignore the testsuite and some other files when creating a tarball
with git archive. This is also used by github for 'releases'.
improve SolutionTransfer exception

parallel::distributed::SolutionTransfer only works with parallel::distributed::Triangulation. This is now checked in the constructor.
Merge pull request #376 from tjhei/export_ignores

add .gitattributes
Merge pull request #377 from tjhei/solution_transfer_msg

improve SolutionTransfer exception