Updating docs
test commit with nothing to add

Merge branch 'master' of https://github.com/dyerlab/popgraph

Conflicts:
	NAMESPACE
	man/alt.Rd
	man/baja.Rd
	man/centroid_distance.Rd
	man/centroid_variance.Rd
	man/congruence_topology.Rd
	man/decorate_graph.Rd
	man/lopho.Rd
	man/popgraph-package.Rd
	man/test_congruence.Rd
	man/theme_empty.Rd
	man/to_SpatialLines.Rd
	man/to_SpatialPoints.Rd
	man/to_html.Rd
	man/to_json.Rd
	man/to_kml.Rd
	man/to_matrix.Rd
	man/to_pgraph.Rd
	man/upiga.Rd