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/wasi-common/wig/Cargo.toml

@@ -2,11 +2,12 @@
 name = "wig"
 version = "0.1.0"
 authors = ["Dan Gohman <sunfish@mozilla.com>"]
-edition = "2018"
+description = "WebAssembly Interface Generator"
+license = "Apache-2.0 WITH LLVM-exception"
 categories = ["wasm"]
 keywords = ["webassembly", "wasm"]
-license = "Apache-2.0 WITH LLVM-exception"
 repository = "https://github.com/CraneStation/wasmtime"
+edition = "2018"
 
 [lib]
 proc-macro = true
@@ -18,3 +19,6 @@ proc-macro2 = "1.0.6"
 # to use the witx parser it contains, rather than the witx crate from
 # crates.io, so that it always matches the version of the witx files.
 witx = { path = "../WASI/tools/witx" }
+
+[badges]
+maintenance = { status = "actively-developed" }