Move library crates under 'lib/'.

Give these crates each a more standard directory layout with sources in
a 'src' sub-sirectory and Cargo.toml in the top lib/foo directory.

Add license and description fields to each.

The build script for the cretonne crate now lives in
'lib/cretonne/build.rs' separating it from the normal library sources
under 'lib/cretonne/src'.

lib/filecheck/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+authors = ["The Cretonne Project Developers"]
+name = "filecheck"
+version = "0.0.0"
+description = "Library for matching test outputs against filecheck directives"
+license = "Apache-2.0"
+repository = "https://github.com/stoklund/cretonne"
+publish = false
+
+[lib]
+name = "filecheck"
+
+[dependencies]
+regex = "0.1.71"