Display SIS class numbers on schedule

_Issue by **[Undeterminant](https://github.com/Undeterminant)** from Thursday Nov 07, 2013 at 03:42 GMT_
_Originally opened as https://github.com/benrr101/schedulemaker/issues/133_

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Unsure if this is even possible, but it'd be pretty awesome if I could just copy the number for the course off of the CSH scheduler and into my shopping cart instead of navigating through the SIS's atrocious UI and searching for it manually.