This is an awful bug in 1.0 to say the least
Where you have
Wire.write(0);
replace it with
Wire.write(zero);
then at the top of your code, under int a,b
byte zero = 0x00;
and you are good to go 
This is an awful bug in 1.0 to say the least
Where you have
Wire.write(0);
replace it with
Wire.write(zero);
then at the top of your code, under int a,b
byte zero = 0x00;
and you are good to go