MAINT: Docker - Update base Ubuntu image & ANTs, makefile

[oesteban]

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[codecov]

Codecov Report

Merging #173 (2998635) into master (31b7d89) will increase coverage by 2.87%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
+ Coverage   93.88%   96.75%   +2.87%     
==========================================
  Files          19       19              
  Lines        1357     1358       +1     
  Branches      176      176              
==========================================
+ Hits         1274     1314      +40     
+ Misses         61       24      -37     
+ Partials       22       20       -2     

Flag	Coverage Δ
travis	93.88% <ø> (ø)
unittests	96.75% <ø> (?)

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Impacted Files	Coverage Δ
sdcflows/workflows/outputs.py	93.54% <0.00%> (+1.61%)	⬆️
sdcflows/interfaces/reportlets.py	89.83% <0.00%> (+1.69%)	⬆️
sdcflows/interfaces/bspline.py	92.45% <0.00%> (+1.92%)	⬆️
sdcflows/interfaces/fmap.py	96.96% <0.00%> (+19.69%)	⬆️
sdcflows/utils/phasemanip.py	94.02% <0.00%> (+28.35%)	⬆️

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