add classes
Create README.md
test
test
Updated so builds networks adding a speed and thus time to travel an edge based on th attirbutes in the network shapefile. Untested to see if still works with a network with no weights.
Changes made to improve the loading of shapefiles and to start importing from the database, though this is not finished yet.
add speed
added speed

Merge https://github.com/nharris172/ncl_visualise

Conflicts:
	example.py
	ncl_network_sim/__init__.py
	ncl_network_sim/classes.py
	ncl_visualize/__init__.py