More permissive suggested flags, explanation of snippets, warning of SHELL not being bash when using chruby
Use configDefaults export to put settings in the settings page
Display stderr as well

So if there is an issue like https://github.com/postmodern/chruby/issues/284
then it is displayed to the user so they don't have to know enough to check
logs to figure out what they need to do to fix it (in general, there shouldn't
be any stderr so this shouldn't matter in other use cases)
Prepare 1.4.0 release