Fixed issue #13

Changed pwm test code for LPC1114 using P1_1 (CT32B1_MAT0) and P1_2
(CT32B1_MAT1).

[PWM test (MBED_5) result]
Initialize PWM on pin 13 with duty cycle: 0.75
Initialize PWM on pin 14 with duty cycle: 0.50
{success}
{end}