Added getImage() to ResourceLoader.
Use ResourceLoader.getImage() in PDFHandler to load humboldt logo
correctly.
Use ResourceLoader.getStream() in CSVHandler to load properties file
correctly.
Deleted unnecessary resources.
Deleted unnecessary ressources (themes/mytheme).
Merge pull request #718 from B3nRa/UseResourceLoader#683#684_secondTry

Use resource loader#683#684 second try