Lxdock make clean

[johncurley]

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[robvdl]

Thanks that closes #132

That only happened to me once and having make clean would have been nice

[codecov-io]

Codecov Report

Merging #138 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #138   +/-   ##
=======================================
  Coverage   91.72%   91.72%           
=======================================
  Files          45       45           
  Lines        1293     1293           
=======================================
  Hits         1186     1186           
  Misses        107      107

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