Added ApplyXFM interface

[astewartau]

No description provided.

[codecov-commenter]

Codecov Report

Merging #30 (4cdd1ec) into master (094cec2) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master     #30      +/-   ##
=========================================
- Coverage    0.87%   0.85%   -0.02%     
=========================================
  Files          25      26       +1     
  Lines         343     349       +6     
  Branches       43      44       +1     
=========================================
  Hits            3       3              
- Misses        340     346       +6     

Impacted Files	Coverage Δ
pydra/tasks/fsl/preprocess/applyxfm.py	0.00% <0.00%> (ø)

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[astewartau]

The tests for ApplyXFM should work now. :)