Updated style of Hamster.set spec
Updated style of Set#dup spec
Updated style of Set#count spec, added a test
Updated style of Set#delete spec, added a test
Updated style of Set#difference spec, added a test
Removed extraneous line from Set#disjoint? spec
Updated style of Set#each spec, added a test
Updated style of Set#empty? and Set.empty spec
Updated style of Set#^ spec, added a test case
Updated style of Set#filter spec, added a test
Updated style of Set#find spec, made a test stricter
Updated style of Set#flatten spec, added a test
Small tweak to Set#grep spec
Updated style of Set#group_by spec, added a couple tests
Updated style of Set#hash spec, added a test
Updated style of Set#head spec, added a test
Updated style of Set#include? spec, added several tests
Updated style of Set#inspect spec
Removed extraneous line from Set#intersect spec
Updated style of Set#intersection spec, added a test