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/reader/src/lib.rs

@@ -0,0 +1,21 @@
+//! Cretonne file reader library.
+//!
+//! The cton_reader library supports reading .cton files. This functionality is needed for testing
+//! Cretonne, but is not essential for a JIT compiler.
+
+extern crate cretonne;
+
+pub use error::{Location, Result, Error};
+pub use parser::{parse_functions, parse_test};
+pub use testcommand::{TestCommand, TestOption};
+pub use testfile::{TestFile, Details};
+pub use isaspec::IsaSpec;
+pub use sourcemap::SourceMap;
+
+mod error;
+mod lexer;
+mod parser;
+mod testcommand;
+mod isaspec;
+mod testfile;
+mod sourcemap;