Add node size and edge width scaling based on property values

[michaelnchin]

Issue #, if available: #28

Description of changes:

• Added -sn/--node-scaling-property and -se/--edge-scaling-property to query magics. These options are specified along with property names, the values of which will be used to scale the widths of edges, and size of nodes.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.