Implement slides

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See documentation for how they work. Basically, if a piece lands on the first 
space of a slide that is not its color, it slides to the end of the slide, 
bumping any pawns that were sitting on the slide.

Original issue reported on code.google.com by roryookane on 20 Mar 2014 at 8:43

• Blocked on: #14

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Bruce said in an email he will work this.

Original comment by roryookane on 20 Mar 2014 at 9:15

• Added labels: Priority-High
• Removed labels: Priority-Medium

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Original comment by roryookane on 21 Mar 2014 at 12:02

• Changed state: Started

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Bruce in an email:

> The code I've been working on for the slides doesn't work. The board 
recognizes when a piece lands on the start of a slide, but the pieces don't 
move down the slide or bump other pieces. If someone wants to try to fix the 
code or any other issue, that's fine, but it's getting late and the game works 
pretty well as is so I'm done working on it.

Original comment by roryookane on 21 Mar 2014 at 4:14