BF: Reject invalid project URLs

[bpoldrack]

Closes #139

[codecov-io]

Codecov Report

Merging #141 (73e3af4) into master (6d63ff8) will increase coverage by 0.15%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
+ Coverage   15.11%   15.27%   +0.15%     
==========================================
  Files          40       40              
  Lines        2540     2547       +7     
==========================================
+ Hits          384      389       +5     
- Misses       2156     2158       +2     

Impacted Files	Coverage Δ
datalad_osf/git_remote.py	0.00% <0.00%> (ø)
datalad_osf/tests/test_public.py	97.14% <100.00%> (+0.47%)	⬆️

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[bpoldrack]

I assume the github action for windows can be disabled with windows being tested on appveyor or is there a reason for it still lingering around, @mih?

[mih]

I assume the github action for windows can be disabled with windows being tested on appveyor or is there a reason for it still lingering around, @mih?

It can go AFAICS