Fix javadoc.
Write the first bytes to the buffer correctly.

buffer is used as a ring buffer so new bytes have to go in at the end.
Do not use a BiMap.
Supply the frame’s content.
Add parser for FLAC metadata.
Return a list of metadata blocks because they do have an order.
Add identifier for FLAC streams.
Fix read(byte[]) method.
Declare the current samples array as final.
Add test case for RememberingInputStream.
Add FLAC identifier and fix comments.
Add marker for unknown metadata.
Rename dummy filter to basic filter.
Pull all interfaces into a single interface: Filter.
Hand in changed metadata to superclass.
Remove now obsolete predicate filter.
Merge remote-tracking branch 'github/master'