android opencv 테스트 환경

http://webnautes.tistory.com/1054
http://wrongwrong163377.hatenablog.com/entry/2017/07/02/034003
http://wrongwrong163377.hatenablog.com/entry/2017/07/01/204124


    defaultConfig {

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11 -frtti -fexceptions"
                abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
            }
        }
    }



    sourceSets {
        main {
            jniLibs.srcDirs = ['src/main/jniLibs']
        }
    }
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }