FIX: Amend some error types

[oesteban]

Trying to normalize a little between TypeErrors and ValueErrors.

[pull-assistant]

Best reviewed: commit by commit

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Optimal code review plan

     FIX: Amend some error types

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[codecov-io]

Codecov Report

Merging #63 into master will decrease coverage by 0.1%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
- Coverage   98.52%   98.42%   -0.11%     
==========================================
  Files          11       11              
  Lines         951      951              
  Branches      130      130              
==========================================
- Hits          937      936       -1     
  Misses          7        7              
- Partials        7        8       +1

Flag	Coverage Δ
#unittests	98.42% <100%> (-0.11%)	⬇️

Impacted Files	Coverage Δ
nitransforms/linear.py	96.05% <100%> (ø)	⬆️
nitransforms/nonlinear.py	100% <100%> (ø)	⬆️
nitransforms/base.py	98.85% <0%> (-0.58%)	⬇️

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[mgxd]

I see we include a custom TransformError - should that be raised instead?

[oesteban]

Let's check on all error types when merging into nibabel (#110).