Fix relative iris with colons

[justin-tay]

Closes #1146

Fix the issue where a relative iri with a colon is treated as an absolute iri.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.13%. Comparing base (48ca3c2) to head (1aeea15).
Report is 92 commits behind head on master.

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Additional details and impacted files

@@ Coverage Diff @@ ## master #1147 +/- ## ============================================ - Coverage 78.90% 78.13% -0.78%  - Complexity 1965 2065 +100  ============================================ Files 172 201 +29 Lines 6352 6859 +507 Branches 1255 1255 ============================================ + Hits 5012 5359 +347  - Misses 867 1033 +166  + Partials 473 467 -6 

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