Move the 'meta' dir to 'lib/cretonne/meta'.

The 'lib/cretonne' directory will be the new root of a stand-alone
cretonne crate containg both Python and Rust sources.

This is in preparation for publishing crates on crates.io.

lib/cretonne/meta/check.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -e
+cd $(dirname "$0")
+
+# Run unit tests.
+python -m unittest discover
+
+# Check Python sources for Python 3 compatibility using pylint.
+#
+# Install pylint with 'pip install pylint'.
+pylint --py3k --reports=no -- *.py cretonne isa
+flake8 .