Fix body2head_rotations.

[lkilcher]

Addressing issue #65.

[codecov[bot]]

Codecov Report

Merging #66 into master will increase coverage by 0.48%. The diff coverage is 86.84%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   45.71%   46.20%   +0.48%     
==========================================
  Files          61       61              
  Lines        7207     7278      +71     
==========================================
+ Hits         3295     3363      +68     
- Misses       3912     3915       +3     

Impacted Files	Coverage Δ
dolfyn/adv/motion.py	60.58% <25.00%> (-0.46%)	:arrow_down:
dolfyn/rotate/base.py	83.01% <50.00%> (ø)
dolfyn/data/velocity.py	51.74% <76.47%> (+2.27%)	:arrow_up:
dolfyn/rotate/vector.py	83.59% <84.61%> (+2.01%)	:arrow_up:
dolfyn/_version.py	76.47% <100.00%> (ø)
dolfyn/data/base.py	35.77% <100.00%> (+6.30%)	:arrow_up:
dolfyn/io/base.py	78.18% <100.00%> (+1.25%)	:arrow_up:
dolfyn/io/hdf5.py	79.31% <100.00%> (+2.38%)	:arrow_up:
dolfyn/io/nortek.py	89.62% <100.00%> (+0.05%)	:arrow_up:
dolfyn/io/nortek2.py	83.54% <100.00%> (ø)
... and 8 more

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[lkilcher]

This closes #65.