Merge pull request alibaba#237 from gofortime/master

Update the makefile for ywss4linkkit.

delete unused print & fix iar compile problem & adjust guiapp sensor …

…read interval

Merge pull request alibaba#117 from wanglingsong/dev_esp32_gpio_hal_

Free isr service related resources in hal_gpio_finalize

code synchronization at 2018-01-05@19:16

Update README.md

format adjust

aos1.1.1 realse

fix krhino_work_init bug