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/runtime/Cargo.toml

@@ -3,10 +3,10 @@ name = "wasmtime-runtime"
 version = "0.2.0"
 authors = ["The Wasmtime Project Developers"]
 description = "Runtime library support for Wasmtime"
+license = "Apache-2.0 WITH LLVM-exception"
 categories = ["wasm"]
 keywords = ["webassembly", "wasm"]
 repository = "https://github.com/CraneStation/wasmtime"
-license = "Apache-2.0 WITH LLVM-exception"
 readme = "README.md"
 edition = "2018"
 
@@ -18,7 +18,7 @@ wasmtime-environ = { path = "../environ", default-features = false }
 region = "2.0.0"
 lazy_static = "1.2.0"
 libc = { version = "0.2.60", default-features = false }
-memoffset = "0.5.1"
+memoffset = "0.5.3"
 indexmap = "1.0.2"
 hashbrown = { version = "0.6.0", optional = true }
 spin = { version = "0.5.2", optional = true }
@@ -33,8 +33,13 @@ cc = "1.0"
 [features]
 default = ["std"]
 std = ["cranelift-codegen/std", "cranelift-wasm/std", "wasmtime-environ/std"]
-core = ["hashbrown/nightly", "cranelift-codegen/core", "cranelift-wasm/core", "wasmtime-environ/core", "spin"]
+core = [
+    "hashbrown/nightly",
+    "cranelift-codegen/core",
+    "cranelift-wasm/core",
+    "wasmtime-environ/core",
+    "spin"
+]
 
 [badges]
-maintenance = { status = "experimental" }
-travis-ci = { repository = "CraneStation/wasmtime" }
+maintenance = { status = "actively-developed" }