Drop support for node v0.5.4-v0.5.5. Fix >= v0.5.6.
Drop support for node v0.5.4-v0.5.5. Fix >= v0.5.6.

Who cares about those two weird versions.

PlayNetwork/node-lame,EQ4/node-lame,PlayNetwork/node-lame,TooTallNate/node-lame,dag10/node-lame,PlayNetwork/node-lame,mcanthony/node-lame,EQ4/node-lame,shine-on/node-lame,mcanthony/node-lame,shine-on/node-lame,dag10/node-lame,EQ4/node-lame,mcanthony/node-lame,shine-on/node-lame,TooTallNate/node-lame,TooTallNate/node-lame,dag10/node-lame