Bump to version 1.4.9
Bump to version 1.4.9

Changes:
  - Require 'enum34' only for Python<3.4
  - Create plotly module
  - Specify morph_stats example config path in help
  - Fix: Section type constants are shown as integers #697
  - 3-points contours are not longer interpreted as SomaThreePoint

mgeplf/NeuroM,eleftherioszisis/NeuroM,BlueBrain/NeuroM,wizmer/NeuroM,lidakanari/NeuroM