Add showSimilarity() to plot neurons with segments coloured by similarity
Merge branch 'refs/heads/master' into feature/similarity

* refs/heads/master:
  Set smat_alpha as default score matrix
  Add smat and smat_alpha
Use package's default smat
Merge branch 'refs/heads/feature/similarity'

* refs/heads/feature/similarity:
  Use package's default smat
  Add showSimilarity() to plot neurons with segments coloured by similarity

Conflicts:
	NAMESPACE
	R/neuriteblast.r