added extends information to the historage
added pull_up_method.py
fixed bug
Created "Method" class.
added SubclassMethod class
removed uncommented code
removed unused variable.
formatted code
renamed result to pull_up_method_candidates
Added similarity calculation process.
matching parameter types of the method.
changed rule of pull up method.
changed output information
formatted code
Merge branch 'detect-pull-up-method'
added entry_points for pull_up_method detection
Merge branch 'add-pull-up-method-command'