Update SDK Tools to v.24.0.1 and Build Tools to v.21.1.2

Update SDK Tools version to 24.0.1
Update SDK Tools checksum (sha256sum)
Update SDK Build Tools version to 21.1.2

Google released a new version of SDK tools, further information here:
https://developer.android.com/sdk/index.html#Other

Download:
http://dl.google.com/android/android-sdk_r24.0.1-linux.tgz
Merge pull request #417 from ardock/pr-update-android-sdk-cookbook

Update SDK Tools to v.24.0.1 and Build Tools to v.21.1.2