v0.5.0

• Added support for reading and writing Wave files containing 32 and 64-bit floating point sample data.
• Added support for buffers that contain floating point data (i.e., samples between -1.0 and 1.0), including the ability to convert to and from PCM buffers.
• Added a new Duration object which can be used to calculate the playback time given a sample rate and number of sample frames.
• New attributes: Reader.current_sample_frame, Reader.total_sample_frames, and Writer.total_sample_frames.
• Ability to get these attributes as a Duration object as well: Reader.total_duration, Writer.total_duration.
• The 2nd argument to Format.new now indicates the sample format, not the bits per sample. For example, :pcm_16 or :float_32 instead of 8 or 16. For backwards compatibility, 8, 16, and 32 can still be given and will be interpreted as :pcm_8, :pcm_16, and :pcm_32, but this support might be removed in the future.
• Bug fix: Wave files are no longer corrupted when an unhandled exception occurs inside a Writer block. (Thanks to James Tunnell (https://github.com/jamestunnell) for reporting and fixing this).
• Bug fix: Writer.file_name now returns the file name, instead of always returning nil (Thanks to James Tunnell (https://github.com/jamestunnell) for reporting this).
• Info.duration now returns a Duration object, instead of a hash.
• Info.sample_count has been renamed sample_frame_count.