Adding ability to pass aligned group to Imagestack.from_path_or_url

[shanaxel42]

This adds the ability to pass an aligned group when loading an Imagestack from the cli.

closes out (fixes #985)

[codecov-io]

Codecov Report

Merging #1069 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1069      +/-   ##
==========================================
+ Coverage   88.82%   88.82%   +<.01%     
==========================================
  Files         167      167              
  Lines        6486     6489       +3     
==========================================
+ Hits         5761     5764       +3     
  Misses        725      725

Impacted Files	Coverage Δ
starfish/experiment/experiment.py	82.87% <100%> (-1.5%)	⬇️
starfish/imagestack/imagestack.py	93.82% <100%> (+0.03%)	⬆️
starfish/imagestack/parser/crop.py	92.3% <100%> (+1.13%)	⬆️

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