Implement SpikAuth

[jcbf]

SkipAuth, when set to ON, will skip evaluation when the user authnticates

[codecov]

Codecov Report

Merging #75 into master will increase coverage by 5.11%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   89.09%   94.20%   +5.11%     
==========================================
  Files           1        1              
  Lines         587      587              
==========================================
+ Hits          523      553      +30     
+ Misses         64       34      -30     

Impacted Files	Coverage Δ
smf-spf.c	94.20% <87.50%> (+5.11%)	⬆️

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[coveralls]

Coverage increased (+0.07%) to 89.298% when pulling b7727bc on jcbf/skip_auth into b050077 on master.

[coveralls]

Coverage increased (+4.6%) to 93.836% when pulling 57f7140 on jcbf/skip_auth into b050077 on master.