Laban Sköllermark 457e8fdcee Continue supporting HUGO_ENV
Revert some of the changes done in
a7324c5f15effe5d2b78992fc7b829b29152a7f9. Continue supporting the
environment variable "HUGO_ENV" which doesn't affect Hugo while still
supporting the new, official ways of setting the environment.

<body> will however get a class named by the official environment only
since it would be confusing to add both a "development" class and a
"production" class at the same time if the site is rendered using this
command for instance:

  $ HUGO_ENV=production hugo server
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..
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