[ruby-mode] dot-alignment support for multi-line method chaining

[Bozhidar Batsov]

Currently when doing method chaining on multiple lines we get the following indentation:

something.ala

  .one

  .two

  .three

An alternative style that seems to be popular is:

something.ala

               .one

               .two

               .three

Here are some references (not just for Ruby):

* http://en.wikipedia.org/wiki/Fluent_interface

* https://github.com/bbatsov/ruby-style-guide/pull/176#issuecomment-18664622

I guess it will be good if ruby-mode supported the alternative style via some customisable option.

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Cheers,

Bozhidar