Compiler#visit_implication, Compiler#visit_intersection and a couple of changes in specs #452
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The 1st part of the PR adds missing visitor methods to Compiler and also adds examples for composite types to its spec.
And I also noticed in implication & intersection specs messing examples describing "#meta", probably were copy-pasted from sum_spec.rb and left as is. Sum#meta behaviour is defined explicitly and differs from the other composite types, so this PR fixes it.