FIX: Load arrays of linear transforms from FSL files

[oesteban]

Implements importing series of textfiles (.000, ...) generated by FSL tools (e.g., MCFLIRT).

References: #40.

[oesteban]

Done both suggestions - thanks!

[codecov-commenter]

Codecov Report

Merging #142 (1112ac3) into master (b40aff7) will decrease coverage by 0.24%.
The diff coverage is 84.37%.

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
- Coverage   98.88%   98.64%   -0.25%     
==========================================
  Files          12       12              
  Lines        1081     1109      +28     
  Branches      164      168       +4     
==========================================
+ Hits         1069     1094      +25     
- Misses          6        7       +1     
- Partials        6        8       +2     

Flag	Coverage Δ
travis	98.64% <84.37%> (-0.25%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nitransforms/io/fsl.py	93.00% <80.00%> (-1.94%)	⬇️
nitransforms/io/base.py	100.00% <100.00%> (ø)
nitransforms/linear.py	97.63% <100.00%> (+0.02%)	⬆️

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