New Macro to the Pyramid series: pyarmid_SlideRack.lua

The macro is simliar to pyramid_TapRod.lua except it clicks the "Dig around this block", until it finds "Slide a rolling rack" to click.

Minor text updates to pyramid_TapRod.lua
Adding 2 images: DigAround.png and slideRollingRack.png
Merge pull request #128 from Cegaiel/master

New Macro to the Pyramid series: pyarmid_SlideRack.lua