Update Shared Rules for 7th Edition BRB.

Also begin the long work of linking to Shared Rules from entries.
Also increment revision number to v36.
Also add default weapons for Assault Squad Sergeant.
Replace most remaining Special Rules with Links.

Also add some 7th Edition FAQ errata and replace You Cannot Hide.
Changes to Dark Angel Company Veterans Squad

Pairs of Lightning Claws are 30 points, not 15.
Set Drop Pod default to Storm Bolter.
Limit Special Weapons to one per five Veterans.
Merge pull request #86 from axisofentropy/master

Dark Angels - Shared Rules

* added shared rules
* added default weapons for Assault Squad Sergeant
* added missing special rules for Scouts
* changes to Company Veterans Squad