Add wsf file identification

[FernandoDoming]

No description provided.

[coveralls]

Coverage increased (+0.06%) to 93.22% when pulling f5787ab on FernandoDoming:formatid into ff6e350 on jbremer:master.

[codecov-io]

Codecov Report

Merging #16 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   93.69%   93.75%   +0.05%     
==========================================
  Files          22       22              
  Lines         936      944       +8     
==========================================
+ Hits          877      885       +8     
  Misses         59       59

Impacted Files	Coverage Δ
sflock/ident.py	91.04% <100%> (+1.21%)	⬆️

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[jbremer]

Cherry-picked it in, thanks!