Add unittests for utils

[fluix-dev]

trafficstars

Progress tracking for utilities is now on #1422.

[codecov-commenter]

Codecov Report

Merging #1415 into master will increase coverage by 3.74%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1415      +/-   ##
==========================================
+ Coverage   37.92%   41.66%   +3.74%     
==========================================
  Files         198      208      +10     
  Lines       11339    11672     +333     
==========================================
+ Hits         4300     4863     +563     
+ Misses       7039     6809     -230     

Impacted Files	Coverage Δ
judge/utils/tests/test_cachedict.py	100.00% <100.00%> (ø)
judge/utils/tests/test_camo.py	100.00% <100.00%> (ø)
judge/utils/tests/test_diggpaginator.py	100.00% <100.00%> (ø)
judge/utils/tests/test_file_cache.py	100.00% <100.00%> (ø)
judge/utils/tests/test_opengraph.py	100.00% <100.00%> (ø)
judge/utils/tests/test_ranker.py	100.00% <100.00%> (ø)
judge/utils/tests/test_stats.py	100.00% <100.00%> (ø)
judge/utils/tests/test_strings.py	100.00% <100.00%> (ø)
judge/utils/tests/test_two_factor.py	100.00% <100.00%> (ø)
judge/utils/tests/test_unicode.py	100.00% <100.00%> (ø)
... and 26 more

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[fluix-dev]

I'd rather not have this get stale.

[quantum5]

What's going on with this one?