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Commit 2018-12-17 09:08 b140a079

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chore(category_theory/limits/limits): Add missing lemmas (#520)

Estimated changes

Modified category_theory/limits/limits.lean

added theorem category_theory.limits.colimit.pre_id

added theorem category_theory.limits.colimit.pre_map'

added theorem category_theory.limits.limit.id_pre

added theorem category_theory.limits.limit.map_pre'