🙅🏻‍♂️ add REJECTED choice and cli to reject analyses

[juanesarango]

See PR regarding REJECTED status:

• https://github.com/papaemmelab/isabl_web/pull/29

What to expect:

• 📘   I submitted a PR to the documentation accordingly
• ✅   I have added tests to cover my changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (31b715f) 95.12% compared to head (c59cc91) 95.13%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   95.12%   95.13%   +0.01%     
==========================================
  Files          19       19              
  Lines        2358     2365       +7     
==========================================
+ Hits         2243     2250       +7     
  Misses        115      115              

Files	Coverage Δ
isabl_cli/api.py	95.12% <100.00%> (ø)
isabl_cli/app.py	98.25% <100.00%> (ø)
isabl_cli/commands.py	95.43% <100.00%> (+0.12%)	⬆️
isabl_cli/factories.py	100.00% <100.00%> (ø)
isabl_cli/options.py	82.81% <ø> (ø)
isabl_cli/settings.py	98.46% <ø> (ø)

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