Revert "Clean the spotify folder before copying the new files"

This reverts commit 36d0d3f352702de05d771921277cc5ec8c31ab2c.

I had second thoughts about deleting the entire contents of a folder. It could
destroy someone's work if they're are developing within the spotify folder.
Added grunt configurations to allow for working in the spotify folder OR a separate folder

The default task runs jshint and jasmine followed by a watch task that will re-run jshint and jasmine whenever a project js file changes.
The deploy task does the same but includes a copy task after jshint and jasmine. The copy task copies the project files to the spotify folder so it can be run.

Use the former if you clone the repository to the spotify folder and do all your work in there. The latter is useful if you prefer to work in a different folder.