Widespread grammar fixes! Still loads I've yet to fix. It'll take forever.

Resolved Issue 333: The plastic flaps on the mining station now actually block air-flow. http://code.google.com/p/tgstation13/issues/detail?id=333
Fix for runtime in issue 332 until getrev is fixed. https://code.google.com/p/tgstation13/issues/detail?id=332
Resolved Issue 331 https://code.google.com/p/tgstation13/issues/detail?id=331
Resolved Issue 304 https://code.google.com/p/tgstation13/issues/detail?id=304
Removed a lever I found randomly placed within the asteroid rock.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@3021 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/power/apc.dm

@@ -161,9 +161,9 @@
 
 		else
 			if (stat & MAINT)
-				usr << "The cover is closed. Something wrong with it: it's doesn't work."
+				usr << "The cover is closed. Something wrong with it: it doesn't work."
 			else if (malfhack)
-				usr << "The cover is broken. It's may be hard to force it open."
+				usr << "The cover is broken. It may be hard to force it open."
 			else
 				usr << "The cover is closed."
 

code/modules/power/lighting.dm

@@ -366,7 +366,7 @@
 // called when area power state changes
 
 /obj/machinery/light/power_change()
-	spawn(rand(0,15))
+	spawn(0)  //rand(0,15)
 		var/area/A = src.loc.loc
 		A = A.master
 		seton(A.lightswitch && A.power_light)

code/modules/power/port_gen.dm

@@ -188,7 +188,7 @@ display round(lastgen) and plasmatank amount
 	attackby(var/obj/item/O as obj, var/mob/user as mob)
 		if(istype(O, text2path(coin_path)))
 			if(coins >= max_coins)
-				user << "\red The generator already has it's maximum amount of fuel!"
+				user << "\red The generator already has its maximum amount of fuel!"
 				return
 			coins++
 			user.drop_item()