General Cargo.toml cleanup. (#529)

* General Cargo.toml cleanup.

 - Remove travis-ci attributes.
 - Remove "experimental" badges from actively-developed crates.
 - Reflow some long lines.
 - Use dependency features consistently.
 - Add readme attributes

* Update WASI to the latest trunk.

This notably adds a .gitignore file for the WASI directory.

crates/misc/rust/macro/Cargo.toml

@@ -2,9 +2,11 @@
 name = "wasmtime-rust-macro"
 version = "0.2.0"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
-edition = "2018"
-license = "Apache-2.0 WITH LLVM-exception"
 description = "Macro support crate for wasmtime-rust"
+license = "Apache-2.0 WITH LLVM-exception"
+repository = "https://github.com/CraneStation/wasmtime"
+readme = "README.md"
+edition = "2018"
 
 [lib]
 proc-macro = true
@@ -15,3 +17,6 @@ doctest = false
 proc-macro2 = "1.0"
 quote = "1.0"
 syn = { version = "1.0", features = ['full'] }
+
+[badges]
+maintenance = { status = "actively-developed" }