Wal e recovery

Add LWRP for wal-e envdir.
Add seperate recovery and archive recipes for wal-e.

@mbautin 
@vnivargi 
Weird formatting. Could be something like
```ruby
vars = {
  'KEY1' => value1,
  'KEY2' => value2
}
```
or
```ruby

vars = { 'KEY1' => value1,
         'KEY2' => value2 }
```