Added packJavaScript task to default gulp task

[loktar00]

When running the default gulp task the scripts_dependencies.js file is never created, this is required to run the templates otherwise you receive an error. The default task also cleans the directory removing the file if it was there and doesn't regenerate it.

This PR just adds the packJavaScript task which generates the above file so a user can run the default task in order to test their template changes.

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[mvktsk]

Review task https://virtocommerce.atlassian.net/browse/VP-7709 has been created

[loktar00]

Sorry for the weird commit there.. new machine git creds weren't setup.