Gradle file that contains many base dependencies

dependencies.gradle

ext {

    //Packages
    supportPackage = 'com.android.support'
    retrofitPackage = 'com.squareup.retrofit2'
    jakeWhartonPackage = 'com.jakewharton'
    glidePackage = 'com.github.bumptech.glide'
    hdodenhofPackage = 'de.hdodenhof'
    reactivePackage = 'io.reactivex'
    eventBusPackage = 'de.greenrobot'
    okHttpPackage = 'com.squareup.okhttp'
    daggerPackage = 'com.google.dagger'
    playServicesPackage = 'com.google.android.gms'
    facebookPackage = 'com.facebook.android'
    javaAnnotationsPackage = 'org.glassfish'

    //Version
    supportVersion = '23.4.0'
    retrofitVersion = '2.0.2'
    okhttpVersion = '2.7.0'
    circleImageVersion = '1.3.0'
    butterknifeVersion = '7.0.0'
    kotterknifeVersion = '0.1.0-SNAPSHOT'
    glideVersion = '3.7.0'
    rxJavaVersion = '1.0.16'
    rxAndroidVersion = '1.0.1'
    eventBusVersion = '2.4.0'
    daggerVersion = '2.1'
    playServicesVersion = '8.4.0'
    facebookVersion = '4.7.0'
    javaAnnotationsVersion = '3.1.1'

    daggerDependencies = [
            compiler: buildDependency(daggerPackage, 'dagger-compiler', daggerVersion),
            dagger  : buildDependency(daggerPackage, 'dagger', daggerVersion)
    ]
    supportDependencies = [
            design           : buildDependency(supportPackage, 'design', supportVersion),
            recyclerView     : buildDependency(supportPackage, 'recyclerview-v7', supportVersion),
            cardView         : buildDependency(supportPackage, 'cardview-v7', supportVersion),
            appCompat        : buildDependency(supportPackage, 'appcompat-v7', supportVersion),
            supportAnnotation: buildDependency(supportPackage, 'support-annotations', supportVersion),
            palette          : buildDependency(supportPackage, 'palette-v7', supportVersion),
            percent          : buildDependency(supportPackage, 'percent', supportVersion),
            customTabs       : buildDependency(supportPackage, 'customtabs', supportVersion)
    ]

    retrofitDependencies = [
            retrofit          : buildDependency(retrofitPackage, 'retrofit', retrofitVersion),
            gson              : buildDependency(retrofitPackage, 'converter-gson', retrofitVersion),
            rxJava            : buildDependency(retrofitPackage, 'adapter-rxjava', retrofitVersion),
            loggingInterceptor: buildDependency(okHttpPackage, 'logging-interceptor', okhttpVersion)
    ]

    rxDependencies = [
            rxJava   : buildDependency(reactivePackage, 'rxjava', rxJavaVersion),
            rxAndroid: buildDependency(reactivePackage, 'rxandroid', rxAndroidVersion)
    ]

    whartonDependencies = [
            butterknife: buildDependency(jakeWhartonPackage, 'butterknife', butterknifeVersion),
            kotterknife: butterknife = buildDependency(jakeWhartonPackage, 'kotterknife', kotterknifeVersion)
    ]

    playServicesDependencies = [
            maps    : buildDependency(playServicesPackage, 'play-services-maps', playServicesVersion),
            location: buildDependency(playServicesPackage, 'play-services-location', playServicesVersion)
    ]

    glide = buildDependency(glidePackage, 'glide', glideVersion)
    eventBus = buildDependency(eventBusPackage, 'eventbus', eventBusVersion)
    circleImageView = buildDependency(hdodenhofPackage, 'circleimageview', circleImageVersion)
    facebookSdk = buildDependency(facebookPackage, 'facebook-android-sdk', facebookVersion)
    javaAnnotations = buildDependency(javaAnnotationsPackage, 'javax.annotation', javaAnnotationsVersion)
}

String buildDependency(String pack, String dependency, String version) {
    return "${pack}:${dependency}:${version}"
}