Adding objgraph

Author: Mark Gibbs

dev_requirements.txt

@@ -20,8 +20,10 @@ decorator==4.3.0
 Django==2.0.5
 docopt==0.6.2
 docutils==0.14
+dpd-components
 Flask==1.0.2
 Flask-Compress==1.4.0
+graphviz==0.8.3
 grip==4.5.2
 hyperlink==18.0.0
 idna==2.6
@@ -36,6 +38,7 @@ livereload==2.5.2
 Markdown==2.6.11
 MarkupSafe==1.0
 nbformat==4.4.0
+objgraph==3.4.0
 packaging==17.1
 path-and-address==2.0.1
 pathtools==0.1.2