Move the wasmtime crate directories form lib/* to wasmtime-*.

This follows a similar change to Cranelift made here:

https://github.com/CraneStation/cranelift/pull/660

wasmtime-wast/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+name = "wasmtime-wast"
+version = "0.1.0"
+authors = ["The Wasmtime Project Developers"]
+publish = false
+description = "wast testing support for wasmtime"
+categories = ["wasm"]
+keywords = ["webassembly", "wasm"]
+repository = "https://github.com/CraneStation/wasmtime"
+license = "Apache-2.0 WITH LLVM-exception"
+readme = "README.md"
+edition = "2018"
+
+[dependencies]
+cranelift-codegen = "0.29.0"
+cranelift-native = "0.29.0"
+cranelift-wasm = "0.29.0"
+cranelift-entity = "0.29.0"
+wasmtime-jit = { path = "../wasmtime-jit" }
+wasmtime-runtime = { path = "../wasmtime-runtime" }
+wasmtime-environ = { path = "../wasmtime-environ" }
+wabt = "0.7"
+target-lexicon = "0.2.0"
+failure = { version = "0.1.3", default-features = false }
+failure_derive = { version = "0.1.3", default-features = false }
+
+[badges]
+maintenance = { status = "experimental" }
+travis-ci = { repository = "CraneStation/wasmtime" }