added module stoch_models for generation of stochastic spike train models
added surrogates module for generation of surrogate spike trains
added xcorr module for spike train cross-correlation analysis
added cubic module for CuBIC correlation analysis of parallel spike trains
conversion module: added new binned_st class for binned spike trains
statistics: added CV, Fano Factor, ISI pdf and peri-event time histogram
Temporarily removed autoimport of neo_tools for neo 0.3 compatibility.
Changed numpy<->np misnaming.
xcorr: changed wrong import statement jelephant to elephant