Backport patches from ruby/ruby#4

Merged

hsbt merged 8 commits intomasterfrom

backport-ruby-core

Nov 28, 2018

Commits on Nov 28, 2018

lib/matrix: Fix potential bug of Vector#angle_with

marcandre
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Matrix: Add #reflexive? method. [Fix GH-1730]

marcandre
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Revert "Matrix: Add #reflexive? method. [Fix GH-1730]"

marcandre
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lib/matrix.rb: Alias antisymmetric? with skew_symmetric?

marcandre
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lib/matrix: use consistent style

marcandre
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lib/matrix: Use consistent style

marcandre
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lib/matrix.rb: Make Matrix & Vector mutable. Add #[]=, #map!.

marcandre
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Tweak Travis CI configuration
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