Modified Bruvo's distance.
Modified ia calculation. Now faster.
Adding files to be ignored
updated vignette
Updated NEWS, increased version number.
Merged stable version and switched to devel.

Merge branch 'master' into devel

Conflicts:
	R/bruvo.r
	src/poppr_distance.c
	vignettes/.gitignore
	vignettes/poppr_manual.Rnw
	vignettes/poppr_manual.log
	vignettes/poppr_manual.pdf
	vignettes/poppr_manual.tex
	vignettes/poppr_manual.toc