2016_03_17_1

• Restructured Dockerfile (Android package install related codes), to fix
  Android package install license acceptance issues.
• system_report.sh now tests whether adb is available, prints it's version
  and lists the content of platform-tools, to check whether the platform-tools
  package was installed correctly

2016_03_11_1

• android-N and build-tools-24.0.0-preview packages pre-installed

2016_01_09_1

• build-tools-23.0.1 is now pre-installed