module `ordered` is private

[kimhyunkang]

Is there a specific reason ordered module is private?

This makes convenient macros such as try! unusable.

For example:

use bson::Document;

fn set_and_get_age() -> Result<i32, MyCustomError> {
  let mut doc = Document::new();
  doc.insert("age".to_string(), 32 as i32);

  let value = try!(doc.get_i32("age"));
  Ok(value)
}

This code does not compile because MyCustomError does not implement From<bson::ordered::ValueAccessError>. You can't provide a custom impl for From, because the module is private.

[zonyitoo]

Because the ordered is just a temporary solution for implementing ordered map. I am still waiting for the linked-hash-map to be stablized.

[zonyitoo]

Merge with #35 .