Merge pull request #18 from pvanhoof/master

giflib 4.2.x doesn't have PrintGifError
Make it possible to disable libicu and libenca based charset detectors
Disable enca based charset detector
Fix handling when no match is found by libicu charset detector
Merge pull request #19 from pvanhoof/master

Add an empty BMP extractor to get the rdf:type for the file type right
Merge pull request #20 from pvanhoof/pvanhoof-enca

Disable enca and make it possible to disable libicu based charset detector
Merge pull request #21 from pvanhoof/libicu-fix

Fix handling when no match is found by libicu charset detector
Don't try to safe album albumart in case title isn't set
Merge pull request #22 from pvanhoof/setalbumart-fix

Don't try to safe album albumart in case title isn't set