Add .gitignore
Add wp-assets directory

`assets` dir in wordpress.org SVN
Configure Grunt

* `makepot` task: generates
`i18n/languages/woocommerce-custom-product-tabs-lite.pot` file
* `copy` task: copies files to `build` directory for WP deploy
* `clean` task: cleans unneeded files from `build` directory (files
that do not need to be checked into SVN)
* `wp_deploy` task: checks out WP.org SVN repo in a `tmp` directory,
commits “Tagging x.xx.x”, creates tag with version x.xx.x, commits
assets. Note: the version is automatically read from readme.txt and the
main plugin file
Add .pot file
1.2.6 Versioning - WC 2.2 Compat

* no changes made to code as it is already 2.2 compatible
* added ‘Requires at least’ and ‘Tested up to’ tags to readme for both
WP & WC
* retained 2.0 compatibility
* updated screenshot to reflect changes in WP 3.8 and WC 2.1
* added plugin icon for WP 4.0