4.15.1 sample update

Merge pull request dji-sdk#929 from dji-sdk/sdk_releases/4.15

4.15 sample update

Merge pull request dji-sdk#796 from dji-sdk/sdk_releases/4.14.1

updata for 4.14.1.

Merge pull request dji-sdk#779 from dji-sdk/sdk_releases/4.14

update for 4.14

Update the version info

update api docs to MSDK 4.13.

Update sample and doc to Android SDK 4.12.

update android sample and api docs to Android SDK 4.11.2.

Update sample to Android SDK 4.11.1.