Elixir-Mode v2.2.7

• #260 - Correct indentation after "for" comprehension
• #259 - Indent receive/after matches correct
• #258 - Emacs hangs if elixir-smie-forward-token returns an empty string
• #253 - Fix Highlight atom issue(atom contains '!', '?', '@')
• #252 - Fix after dot highlighting
• #249 - Add correct indent for "if" inside a "->" block
• #246 - Fix highlighting true, false, nil
• #244 - True,false, nil are highlighted as atoms
• #241 - correct indent for oneline do: when moved to next line
• #240 - Correct indent in case expression when returning a tuple
• #236 - fontify special macros with prefix like '%' and '&'
• #235 - correct indentation for identifiers which contains built in words after a dot