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/lightbeam/Cargo.toml

@@ -2,12 +2,14 @@
 name = "lightbeam"
 version = "0.0.0"
 authors = ["The Lightbeam Project Developers"]
+description = "An optimising one-pass streaming compiler for WebAssembly"
 license = "Apache-2.0 WITH LLVM-exception"
+repository = "https://github.com/CraneStation/wasmtime"
 readme = "README.md"
 categories = ["wasm"]
 keywords = ["webassembly", "wasm", "compile", "compiler", "jit"]
-publish = false
 edition = "2018"
+publish = false
 
 [dependencies]
 smallvec = "1.0.0"
@@ -18,7 +20,7 @@ memoffset = "0.5.1"
 itertools = "0.8"
 capstone = "0.6.0"
 thiserror = "1.0.4"
-cranelift-codegen = { version = "0.49" }
+cranelift-codegen = "0.49"
 multi_mut = "0.1"
 either = "1.5"
 typemap = "0.3"