upgrade build tools version and remove repeated compile sdk property
upgrade gradle plugin
comment out gradle-mvn-push script until the issue [1] get solved.

[1]: https://github.com/chrisbanes/gradle-mvn-push/issues/33
Point the correct property of the compile sdk version in the gradle.properties file
Point correct property ANDROID_BUILD_COMPILE_SDK_VERSION in gradle.properties file
NullPointerException onClick item while list speed os 0 - Fixed