Feature/updated code d3 v4#1

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tzs34 wants to merge 3 commits intosoloman1124:masterfrom

tzs34:feature/updated-code-d3-v4

Commits on Mar 14, 2018

Refactored app.js code for d3 version 4. Breaking chnages introduced from v3 to v4
Dave Thorneycroft
committed
Reverted back master created branch for pull request
Dave Thorneycroft
committed
Refactored app.js for chnages between d3 version 3 and d3 version 4
Dave Thorneycroft
committed