Improve Application Versioning

[jcscottiii]

This will allow for better bug reports and information the binary running.
This information can be retrieved upon providing the -v or --version
flag

Closes #42

docker run --rm xmidt/petasos:local --version
petasos:
  version:      0.1.4+local
  go version:   go1.13.1
  built time:   2019-10-14 15:36:35
  git commit:   0402182
  os/arch:      linux/amd64

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@0402182). Click here to learn what that means.
The diff coverage is 30.43%.

@@           Coverage Diff            @@
##             master     #43   +/-   ##
========================================
  Coverage          ?   8.23%           
========================================
  Files             ?       1           
  Lines             ?      85           
  Branches          ?       0           
========================================
  Hits              ?       7           
  Misses            ?      78           
  Partials          ?       0

Impacted Files	Coverage Δ
main.go	8.23% <30.43%> (ø)

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[kcajmagic]

Nice, looks good.