DRYing version number
Requiring syck to prevent an error
Updating WaveFile dependency from 0.5.0 -> 0.6.0

Adds support for using 24-bit PCM files as samples
Adding Gemfile to aid local development
Adding syck dependency for Ruby 2 and higher

Not including for earlier versions, since it's not needed and
will in fact cause an error if you try to install it.