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 77 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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