Support build-tools
minor upgrade sdk

Minor Upgrade SDK version(21.1 to 22.0.1)
Update README.md
Merge branch 'feature/upgrade' into develop

* feature/upgrade:
  Update README.md
  minor upgrade sdk
Merge branch 'release/0.0.7'

* release/0.0.7:
  Update README.md
  minor upgrade sdk
  Support build-tools
fix android-sdk and remove ANDROID_SDK_HOME variable
add ANDROID_NDK_HOME variable
Merge commit '58359a0ea03659c4673584c3e79c183492f47249' into develop

# By Adam Ochonicki
# Via Taeho Kim (6) and Adam Ochonicki (1)
* commit '58359a0ea03659c4673584c3e79c183492f47249':
  Build status

Conflicts:
	README.md
Merge branch 'release/0.0.8'

# By Taeho Kim (2) and Adam Ochonicki (1)
* release/0.0.8:
  add ANDROID_NDK_HOME variable
  fix android-sdk and remove ANDROID_SDK_HOME variable
  Build status
upgrade android sdk ndk

1. upgrade SDK version(r22.0.1 to 22.2.1)
2. upgrade NDK version(r8e to 9)
3. upgrade boxen and others
upgrade android studio

1. 130.677228 -> 132.883541
Merge branch 'feature/upgrade' into develop

* feature/upgrade:
  upgrade android studio
  upgrade android sdk ndk
Merge branch 'release/0.0.9'

* release/0.0.9:
  upgrade android studio
  upgrade android sdk ndk
Merge pull request #3 from aafwu00/master

upgrade sdk, ndk and studio