Add method for topological sorting#12

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fsobanski wants to merge 22 commits intokevinrutherford:masterfrom

fsobanski:master

Commits on Dec 23, 2017

Add method for topological sorting
Fabian Sobanski
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Commits on Jan 16, 2018

Try to fix travis rbx build.
fsobanski
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Update travis ruby environments
fsobanski
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Beautify ruby code with Rubocop
fsobanski
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Enforce maximal line length of 80 chars
fsobanski
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Remove prefix "is" from private predicate methods
fsobanski
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Fix Rubocop linter warning UselessAssignment
fsobanski
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Remove aliases has_descendent? and has_descendent?
fsobanski
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Remove alias is_reachable_from?
fsobanski
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Rename has_path_to? to path_to? and has_ancestor? to reachable_from?
fsobanski
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Update README
fsobanski
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Update Copyright notice
fsobanski
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Simplify method reachable_from?
fsobanski
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Commits on Jan 17, 2018

Add CONTRIBUTING.md
fsobanski
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Add Ruby 2.5 support
fsobanski
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Store edges in source vertex for performance
fsobanski
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Let path_to? & reachable_from? return false for vertices in other graph
fsobanski
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Increase test coverage
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Update Gemfile
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Revert "Update Gemfile"
fsobanski
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Prohibit parallel edges
fsobanski
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Commits on Jan 18, 2018

Add differences to original dag implementation to README
fsobanski
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