Add `alias` to ensure value

[raphink]

Augeas can now parse alias entries so it should be possible to add this syntax:

shellvar { 'ls':
  ensure => alias,
  value  => 'ls $LS_OPTIONS',
}

[gregswift]

.... i'm not sure if i'd use it because i never manage my bashrc bits with puppet.. but i can definitely see a benefit to it

[raphink]

I see quite a few people trying to manage bashrc files with Puppet. Usually, they end up using file_line for that. I don't know which part (the problem or the solution) is the worst tbh…

[gregswift]

+1 for making the problem the decidedly worse part of the equation