Add support for IRB-alternatives (Pry and Ripl) to `bundle console`.
Set called console to the one in `bundle config console`

IRB alternatives can be selected by setting the config key
`console`, for example with `bundle config console pry`.
Merge pull request #2620 from joallard/consoles

Set called console to the one in `bundle config console`

Conflicts:
	CHANGELOG.md