AndroidStudioでローカルの別プロジェクトをインポートする ref: http://qiita.com/konifar/items/c9f66482ebdca404f8fa
include ':app', 'libraries:pulltorefresh'
Error:(28, 0) Project with path ':libraries:pulltorefresh' could not be found in project ':app'.
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile project(':libraries:pulltorefresh')
}