Aaron Turon f7bb31a47a libstd: set baseline stability levels.
Earlier commits have established a baseline of `experimental` stability
for all crates under the facade (so their contents are considered
experimental within libstd). Since `experimental` is `allow` by
default, we should use the same baseline stability for libstd itself.

This commit adds `experimental` tags to all of the modules defined in
`std`, and `unstable` to `std` itself.
2014-06-30 22:49:18 -07:00
..
2014-06-30 22:49:18 -07:00