NF: add trx info CLI

[skoudoro]

fix #84

Small PR to add trx info myfile.trx CLI

[codecov]

Codecov Report

❌ Patch coverage is 94.93671% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.75%. Comparing base (6b4a53d) to head (5f61255).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
trx/trx_file_memmap.py	75.00%	3 Missing ⚠️
trx/cli.py	97.61%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   59.95%   61.75%   +1.79%     
==========================================
  Files          13       13              
  Lines        2462     2536      +74     
==========================================
+ Hits         1476     1566      +90     
+ Misses        986      970      -16     

Flag	Coverage Δ
unittests	61.75% <94.93%> (+1.79%)	⬆️

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[skoudoro]

Can I go ahead and merge @arokem or @frheault ?

[arokem]

Small nit, but do we want to print something more informative for cases where some item is not there. For example, something like:

No group keys 

When no group keys are encoded?

[skoudoro]

Thanks for the feedback @arokem.

added here: e839036

[skoudoro]

The doc build fails and it is expected. See nipy/nibabel#1463

[arokem]

LGTM! Thanks for making this!