Merge remote-tracking branch 'origin/master'
# Conflicts:
# app/build.gradle
# app/src/main/java/aicare/net/cn/sdk/ailinksdkdemoandroid/MainActivity.java
# app/src/main/java/aicare/net/cn/sdk/ailinksdkdemoandroid/RopeSkippingActivity.java
# app/src/main/java/aicare/net/cn/sdk/ailinksdkdemoandroid/ShowBleActivity.java
# app/src/main/java/aicare/net/cn/sdk/ailinksdkdemoandroid/WeightScaleWifiBleActivity.java
# app/src/main/res/layout/activity_rope_skipping.xml