Safe, high- and low-level Rust bindings to libnice.

See the connects_and_transmits_data test in the file src/ice.rs for a full example of the high-level bindings.

libnice is licensed under both the Mozilla Public License version 1.1 and the GNU Lesser General Public License version 2.1 (just like libnice itself). For the full text of these licenses, see the files LICENSE.MPL and LICENSE.LGPL respectively.