Release of spikeinterface module family

We have release today all module all spikeinterface family:
spikeextractor 0.5.5
spikesorters 0.1.4
spiketoolkit 0.4.0
spikewidgets 0.2.1
spikecomparison 0.1.0

The main idea was to split spiketoolkit in spiketoolkit + spikecomparison + spikesorter to avoid cyclic dependencies.

We will have soon a metapackage spiekinterface that encapsulate all theses tools.