Merge pull request #45 from ahpook/master

Rename ARM-8 to prepare for hiera 2 docs.
ARM-8 Add initial description w. overview and request to environment

This contains a first stab at an introduction to injection and
starts detailing the logical sequence "from request to environment"
Merge pull request #46 from hlindberg/master

initial ARM-8 description
Merge pull request #47 from ahpook/master

Mark ARM-9 withdrawn.
Edited for clarity (I hope)