HDMI pin numbering fixed

HDMI data lines are D0-D2 and not D0-D3.
Add detail about pre-installed package
Improve setBlock documentation
Improve Minecraft usage page
Add screenshots to Minecraft usage page
Reword sentence
Merge pull request #119 from diegoherranz/patch-1

HDMI pin numbering fixed
Add alt text to images to fix the build
Add bash to code blocks
Add bash to code blocks
Add details about pip
Add detail about python 2/3 pip
Pin define and clock config

Add further information about pin definition and clock routing
Typo
Fix nested lists

by inserting a couple of spaces where needed
Merge pull request #3 from raspberrypi/master

updating again