Fix up typos in default.yml

Fix:
 * 'and' -> 'an'
 * 'alignes' -> 'aligns'
 * 'indenation' -> 'indentation'
 * 'separat' -> 'separate'
 * 'interation' -> 'iteration'
Merge pull request #1053 from kevinjalbert/patch-2

Fix up typos in default.yml
Improve LineEndConcatenation's message
[Fixes #1050] Rename rubocop-todo.yml file
Merge pull request #1055 from geniou/rename_todo_file

Rename rubocop-todo.yml file to .rubocop_todo.yml