Move numerator and denominator into clojure.next
Add count to LazySeq
Merge pull request #39 from patrickgombert/move-ratio-into-next

Move numerator and denominator into clojure.next
Merge pull request #41 from patrickgombert/count-lazy-seq

Add count to LazySeq
Lock when calling seq on a LazySeq
Merge pull request #42 from patrickgombert/lock-lazy-seq

Lock when calling seq on a LazySeq