Vendor dependencies for 0.3.0 release

vendor/jni-sys/README.md

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+# jni-sys
+
+[![Build Status](https://travis-ci.org/sfackler/rust-jni-sys.svg?branch=master)](https://travis-ci.org/sfackler/rust-jni-sys) [![Build status](https://ci.appveyor.com/api/projects/status/o59i8b5dwcyswtq3/branch/master?svg=true)](https://ci.appveyor.com/project/sfackler/rust-jni-sys/branch/master)
+
+
+[Documentation](https://docs.rs/jni-sys)
+
+Rust definitions corresponding to jni.h.
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual licensed as above, without any additional terms or
+conditions.