tracker-extract: Added JPEG-IVI extractor
tracker-extract: add faster PNG extractor

This extractor reads metadata properties from the tEXt and iTXt sections of PNG
files, and skips IDAT sections (this is where the increased speed comes from)

Conflicts:
	configure.ac
	src/tracker-extract/Makefile.am

Conflicts:
	src/tracker-extract/Makefile.am
tracker-extract: Added png-faster-ivi
tracker-extract: Pruned some properties from mp3-ivi extractor
tracker-extract: Added GIF-ivi extractor