SeisMIC 0.5.3

This is SeisMIC's release associated with the paper preprint.

Since the last version, a whole lot of chances have happened. Some of them are listed here:

• Spatial Inversion of seismic velocity changes to create a seismic velocity change map
• computing spectrograms directly from the raw data
• computing the waveform coherence
• Performance improvements for single and multi-core computations.
• a whole lot of minor changes (refer to the list of commits for details)