plotter: changed Plot init and TimeSeriesPlot

    - removed use of __new__ in Plot constructor, far too fiddly
    - moved TimeSeriesAxes above TimeSeriesPlot to fix definition
      dependency
DataQualityDict: added comparison methods

    - adapted from glue.segments.segmentlistdict, thanks Kipp
version: changed __version__ syntax in all modules
Series: new decimate method

    - alternative to the resample method, uses scipy.signal.decimate
    - TODO: should actuall use scipy.signal.decimate when the LSCSoft scipy version is  updated
TimeSeries: added fftgram method

    - generates Fourier-gram with FFT every stride