call dust.optimizers.format with the full context

[kilianc]

This would allow something like this:

var env = process.env.NODE_ENV
var compressedByDefault = env === 'production'
var compressedFormat = dust.optimizers.format
var uncompressedFormat = function (ctx, node) { return node }

dust.optimizers.format = function (ctx, node) {
  var compressed = ctx.compressed === undefined ? compressedByDefault : ctx.compressed
  return compressed ? compressedFormat.apply(this, arguments) : uncompressedFormat.apply(this, arguments)
}

[vybs]

similar to : #238 (comment)

But this ticket addresses different modes as well

[sethkinast]

Closing based on resolution in #238 via #511