Fix whitespace
Fix all wildcard matchers so they work within Enumerables
Add WildcardMatcherMatchers

This is for upcoming refactorings of the wildcard matchers.
Refactor #anything and its tests
Refactor #boolean and its tests
Refactor #duck_type and its tests
Move tests for #hash_including matcher to the right place
Refactor #hash_including and its tests
Refactor #is_a and its tests
Refactor #numeric and its tests
Move range wildcard matcher to core_ext
Refactor range wildcard matcher and its tests
Move regexp wildcard matcher to core_ext
Refactor regexp wildcard matcher and its tests
Move tests for #satisfy wildcard matcher to the right place
Refactor #satisfy and its tests