maven build bug fix for sample project
maven build bug fix for sample project

wskplho/android-pull-to-refresh,toker/android-pull-to-refresh,naver/android-pull-to-refresh,wskplho/android-pull-to-refresh,handstudio/android-pull-to-refresh,Ranjan101/android-pull-to-refresh,Ranjan101/android-pull-to-refresh,androidjhent/naver.v2,androidjhent/naver,LinKingR/android-pull-to-refresh