Fix troublesome quotation of font-family name in CSS rule for embedded fonts
Change welcome.odt to have rich text in annotation and embed&use a font

Font is "Sonsie One" from http://www.google.com/fonts,
Licensed under SIL OPEN FONT LICENSE Version 1.1
http://scripts.sil.org/OFL
Merge pull request #502 from kossebau/fixFontEmbedding

Fix font embedding