Refactor Pry::Method.from_str , because of comment on method_or_class_lookup in lib/pry/code_object.rb .
Fix doc for Pry::Method.from_str to match refactoring.
Merge pull request #1082 from yui-knk/refactor-Method.from_str

Refactor Pry::Method.from_str , because of comment on method_or_class_lo...