FIX: --version output in containers

[kaczmarj]

Prior to this PR, the --version output from containers would include dirty, indicating uncommitted changes. This was because /docs was not copied into the docker images.

Before this commit, the version output looks like this:

$ docker run --rm repronim/neurodocker:0.9.1 --version
neurodocker version 0.9.1+0.gad2f3a6.dirty

And after this commit, the version is:

$ docker run --rm neurodocker --version                                                                                           
neurodocker version 0.9.1+8.gf7f2aaf

Note the lack of .dirty in the output.

By excluding /docs from the Docker images, we were modifying the state of the git repository, and git status was reporting uncommitted changes. This caused the command neurodocker --version to show that there were uncommitted changes (by including the dirty suffix in the version). We do not want users to be under the impression that the version includes uncommitted changes. Indeed, kaczmarj excluded /docs from the docker builds as a premature optimization... it turns out that they only consume 136 kb, which is negligible.

[codecov]

Codecov Report

Base: 83.74% // Head: 83.74% // No change to project coverage 👍

Coverage data is based on head (f79ef3e) compared to base (218697a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #493   +/-   ##
=======================================
  Coverage   83.74%   83.74%           
=======================================
  Files          11       11           
  Lines        1015     1015           
=======================================
  Hits          850      850           
  Misses        165      165           

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