Allow to disable log timestamp and add log caller

[crazy-max]

Closes #130

[codecov]

Codecov Report

Merging #148 (f5af60a) into master (3389b51) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #148   +/-   ##
=======================================
  Coverage   63.46%   63.46%           
=======================================
  Files          10       10           
  Lines         104      104           
=======================================
  Hits           66       66           
  Misses         27       27           
  Partials       11       11           

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