Restructured GriegCommons
Moved pl.edu.agh.ki.grieg.util.Resources to GriegCommons
Moved test dependencies to Libs
First classes for decoders SPI
Implemented provider file parser
Added some javadoc
Implemented audio format parsers' loader
Added possibility to specify classloader used to load format parsers and
some tests.
Added some documentation for parser discovery module, incomplete.
Finished doc for parser discovery module
Integrated new SPI mechanism for obtaining audio format parsers.
Extracted WAV and MP3 parsers as separate projects.