export AxisMatrix and AxisVector

[cmichelenstrofer]

see #199

[codecov[bot]]

Codecov Report

Merging #222 (4c13172) into master (19a548e) will decrease coverage by 0.27%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #222      +/-   ##
==========================================
- Coverage   90.00%   89.73%   -0.27%     
==========================================
  Files           7        8       +1     
  Lines         710      711       +1     
==========================================
- Hits          639      638       -1     
- Misses         71       73       +2     

Impacted Files	Coverage Δ
src/AxisArrays.jl	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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[timholy]

Failure on nightly is likely due to improvements in inference (@inferred isn't failing so a @test_broken is receiving a non-Bool).