Add Rewinder test. Works on Node 0.10, fails on Node 0.12
user
```coffeescript
RewindBuffer    = $src "rewind_buffer"
FileSource      = $src "sources/file"
Logger          = $src "logger"

mp3 = $file "mp3/mp3-44100-128-s.mp3"

class BytesReceived extends require("stream").Writable
    constructor: ->
        super
        @bytes = 0

    _write: (chunk,encoding,cb) ->
        @bytes += chunk.length
        @emit "bytes", @bytes
        cb()

describe "Rewinder", ->
    rewind      = null
    source_a    = null

    logger = new Logger {}

    before (done) ->
        rewind = new RewindBuffer seconds:60, burst:30, log:logger
        done()

    before (done) ->
        source = new FileSource format:"mp3", filePath:mp3
        rewind._rConnectSource source, ->
            done()

    describe "Raw audio, not pumped", ->
        rewinder = null

        it "can connect to the rewind buffer", (done) ->
            rewind.getRewinder 0, offsetSeconds:0, (err,r) ->
                throw err if err
                rewinder = r
                done()

        it "should emit data", (done) ->
            this.timeout 4000

            bytes = new BytesReceived

            rewinder.pipe(bytes)

            bytes.once "bytes", =>
                done()



```
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