Implement Thief Ambush Merit ability

Checks for the ambush trait and that the player is behind the monster, the same as it checks for sneak attack.  Each level of the merit should increase accuracy by 3.  Also added this to the ranged check as a final accuracy boost for both throwing and ranged weapons.
Fixed typo in comment
Fixed missing '))'

In the ranged accuracy check
Added GOV Page Mobs
GOV Page
GOV Page Mob Scripts
GOV Page Mob Scripts
GOV Page Mob Scripts
GOV Page Mob Scripts
Spells give enmity even when resisted/no effect

http://kanican.livejournal.com/13848.html?thread=236312#t236312
GOV Page Mobs
GOV Page Mob Scripts
GOV Page Mob Scripts
GOV Page Mob Scripts
Merge pull request #280 from towbes/Ambush

Implement Thief Ambush Ability
Merge pull request #282 from Jupiter065/spell_enmity

Spells give enmity even when resisted/no effect
CORE: fixed interaction with packet based gear swaps and instant cast spells
- fixed laggy equip swap
- lowered time to recalculate path for mobs chasing targets
- corrected mob speed and pathfinding calculations
- speed_mod is applied to mobs in combat
Merge branch 'master' of https://github.com/DarkstarProject/darkstar
CORE: fix acc002eea39f35b9a2864f42874c82fd8a4a6e61
GOV Page Mob Scripts