Mathematical functions application

Yeah, I thought it was a little insane too.. 

adds:

Sum, Multiply, Divide, Subtract, Modulus, GT, LT, GTE, LTE, EQ functions to asterisk

All functions follow the same basic pattern for parameters:

parameter 1 = the name of the return variable
parameter 2 = the operation
parameter 3 = the second number

Each action is perfromed as

 Action param1 on param2

eg: 

 Action = Divide
 Param1 = 10
 Param2 = 2

Results in 

 Divide 10 by 2


Example dialplan:

exten => 11099,1,Math(RV,1+20)
exten => 11099,2,NOOP(${RV})
exten => 11099,3,Math(RV,10*2)
exten => 11099,4,NOOP(${RV})
exten => 11099,5,Math(RV,10*2)
exten => 11099,6,NOOP(${RV})
exten => 11099,7,Math(RV,10-2)
exten => 11099,8,NOOP(${RV})
exten => 11099,9,Math(RV,2%10)
exten => 11099,10,NOOP(${RV})
exten => 11099,11,Math(RV,10/0)
exten => 11099,12,NOOP(${RV})
exten => 11099,13,math(RV,10-200)
exten => 11099,14,NOOP(${RV})
exten => 11099,15,Math(RV,1-20)
exten => 11099,16,NOOP(${RV})
exten => 11099,17,Math(RV,1<20)
exten => 11099,18,NOOP(${RV})
exten => 11099,19,Math(RV,1>=20)
exten => 11099,20,NOOP(${RV})
exten => 11099,21,Math(RV,101>20)
exten => 11099,22,NOOP(${RV})
exten => 11099,23,Math(RV,1==20)
exten => 11099,24,NOOP(${RV})
exten => 11099,25,Math(RV,20<=20)
exten => 11099,26,NOOP(${RV})