Commits on Feb 27, 2015

1. std: Stabilize the env module …

   Now that the `std::env` module has had some time to bake this commit marks most
   of its APIs as `#[stable]`. Some notable APIs that are **not** stable (and still
   use the same `env` feature gate) are:
   
   * `{set,get}_exit_status` - there are still questions about whether this is the
     right interface for setting/getting the exit status of a process.
   * `page_size` - this may change location in the future or perhaps name as well.
   
   This also effectively closes rust-lang#22122 as the variants of `VarError` are
   `#[stable]` now. (this is done intentionally)

   

   alexcrichton committed Feb 27, 2015
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