v0.7.0

• Add Join which combines two collections using the given join method (thks @xunleii)
• Add Without which creates an array excluding all given values (thks @xunleii)
• Add Subset which returns true if a collection is a subset of another (thks @reetuparna)
• Add Join operations, primitives (InnerJoin, OuterJoin, LeftJoin, RightJoin) and typesafe implementations (thks @xunleii)
• Fixed input mutation in Uniq, it returns a copy of the input without the duplicate
• Fixed some typos (thks @anukul)
• Fixed SubtractString when an empty array is passed (thks @alongat)