Only set text eol=lf for certain files, not all (and do in /, not webodf/)

Fixup for a7edf7baad09d98d22eb9a80f94da82bf066ccef
Merge pull request #419 from kossebau/fixGitAttributes

Only set text eol=lf for certain files, not all (and do in /, not webodf/)
Make sure newly created ODT documents have valid manifest.xml and settings.xml files.
Add new layout tests.
Layout tests can be added in layouttests.xml. A file is constructed from
ODF fragments and the loaded and layed out document is checked.
Only a few simple dimensions for are currently checked, more tests will follow.