Harmonize phoebus grasses fully with masterwork raws

Previously phoebus was full of many, many grass types, some
of which had manage to conflict with themselves.

This fixes GH #59
Updated default setings.

* Simple trees, gems, soil, stone, and pets are all on.
* Invaders have base skill changed to zero.
* Default theme changed to 'BLUE'.

See http://www.bay12forums.com/smf/index.php?topic=133174.msg4854894#msg4854894 for discussion.
Docs: Update orc fortress manual. More correct info, better formatting.

* Remvoed mention of the crucible and essence lab. These are not
  used by orcs any more.

* Used much sexy CSS in the freelancers page to make the goblin
  workshops look nicer.
Docs: Updated orcish core industry, incl Blacksmoke and Steamfoundry

* Screenshots for Blacksmoke Furnace and Steamfoundry
* Added description for Steamfoundry
* Massaged HTML and CSS for consistency and clarity
Orc docs: Removed more mentions of crucibles. Better formatting.