Allow ident to be passed to loader options

[Eric Wang]

Expected Behavior / Situation

ident can be passed to loader option

Actual Behavior / Situation

It is removed in 962b1d6#diff-bce88eb40f042401d096992738d1ffa448830370e2e797514de95284d541b3f0

Modification Proposal

Hi we want to stablize the indent because we use webpack's loader-runner to preprocessing some of our css resources. As a consequence, we would like a constant, configurable ident instead of something random.
Also I think it's harmless to have that available in option as well?

[Alexander Akait]

You don't need ident, also you can set it on loader level:

{
  ident: 'ident',
  loader: 'postcss-loader'
}