unit test for pwm implement need to work on a segfault when creating thread
Merge branch 'stable_2.6.x' of github.com:PSAScapstone2014/ChibiOS-RT into stable_2.6.x
made modifications to testhal to pwm
fixed the seg fault issue
Clean up pwm driver
Merge branch 'stable_2.6.x' of github.com:PSAScapstone2014/ChibiOS-RT into stable_2.6.x