hash.slice will crash if keep_key is not in the original hash

[brettcave]

lib/i18n/core_ext/hash.rb#L4 will crash if :some_key is in keep_keys but not in the hash.

A safe way to allow keep_keys to be passed to the slice function that are not in the hash is to add a if has_key?(key):

keep_keys.each { |key| h[key] = fetch(key) if has_key?(key) }

[codegoalie]

I believe this was fixed with #289 and can be closed.

[carlosantoniodasilva]

Thanks.