Fix Young diagram tests

Author: jiahao

test/youngdiagrams.jl

@@ -1,6 +1,3 @@
-using Catalan
-using Base.Test
-
 @test ([5,4,2,2]\[2,1]) == ([5, 4, 2, 2],[2, 1])
 @test isrimhook([4,3,2], [2,2,2])
 @test !isrimhook([4,3,2], [2,2,1])