add support for folder naming strategy

[ezbz]

add support for folder naming strategy, allowing using either the project name or the project path values from the gitlab API.

Fix for #25 fix for #38, closes #39

[codecov]

Codecov Report

Merging #43 (57423a8) into master (2a87cc9) will increase coverage by 0.30%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   95.56%   95.87%   +0.30%     
==========================================
  Files           8        9       +1     
  Lines         316      364      +48     
==========================================
+ Hits          302      349      +47     
- Misses         14       15       +1     

Impacted Files	Coverage Δ
gitlabber/naming.py	92.85% <92.85%> (ø)
gitlabber/cli.py	94.52% <100.00%> (+0.15%)	⬆️
gitlabber/gitlab_tree.py	98.10% <100.00%> (+0.48%)	⬆️

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