Add test showing that we do duplicate source codes [RD-45]
Add mostly-working regex [RD-45]
Replaced regex with string manipulation [RD-45]
Remove unused import [RD-45]
Merge branch 'master' into source-code-collision

Conflicts:
	redirect/tests/views.py
Enforce assumptions about our data [RD-45]
Merge pull request #50 from DirectEmployers/source-code-collision

Ensure that we don't duplicate source codes [RD-45]