Fix for theme template directory issue #167

[timbocode]

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• Have you followed the ClassicCommerce Contributing guideline?
• Does your code follow the repo standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Closes #167 .

How to test the changes in this Pull Request:

1. Create a directory called 'woocommerce' below the active theme directory (e.g. 'mytheme/woocommerce').
2. Copy the 'single-product.php' template file from 'plugins/woocommerce/templates' to 'mytheme/woocommerce'.
3. Make a minor modification to this file (e.g. <?php echo "Hello World"; ?>). On the frontend product page, you should see Hello World.
4. Create a directory called 'classic-commerce' below the active theme directory.
5. Copy the 'single-product.php' template file from 'plugins/woocommerce/templates' to 'mytheme/classic-commerce'.
6. Make a different modification to this file (e.g. <?php echo "Hello Classic Commerce"; ?>). On the frontend, you should now see Hello Classic Commerce.
7. If you delete 'mytheme/woocommerce', you should still see Hello Classic Commerce.

Changelog entry

Enter a short summary of all changes on this Pull Request. This will appear in the changelog if accepted.

Added support for template overrides using a directory called 'classic-commerce' below the active theme. The 'classic-commerce' directory takes priority over any existing 'woocommerce' directory.

[bahiirwa]

Tried and tested. Works well.