Use a custom contest object manager to annotate _now; #1115

[Ninjaclasher]

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Fixes #1115.

[codecov-commenter]

Codecov Report

Merging #1433 into master will increase coverage by 0.03%. The diff coverage is 53.84%.

@@            Coverage Diff             @@
##           master    #1433      +/-   ##
==========================================
+ Coverage   38.44%   38.48%   +0.03%     
==========================================
  Files         201      201              
  Lines       11398    11398              
==========================================
+ Hits         4382     4386       +4     
+ Misses       7016     7012       -4     

Impacted Files	Coverage Δ
judge/views/contests.py	30.02% <20.00%> (+0.04%)	:arrow_up:
judge/views/blog.py	42.10% <33.33%> (+0.54%)	:arrow_up:
judge/models/contest.py	54.17% <100.00%> (+0.72%)	:arrow_up:

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