How to document your dependency list

build.gradle

dependencies {
    compile project(':core')

    // Parser for scanRecord byte array returned from
    // android.bluetooth.BluetoothAdapter.LeScanCallback.onLeScan()
    // This is only needed for pre-Lollipop devices.
    // https://github.com/TakahikoKawasaki/nv-bluetooth
    // Apache 2.0
    compile 'com.neovisionaries:nv-bluetooth:1.7'

    // Better logging
    // https://github.com/JakeWharton/timber
    // Apache 2.0
    compile 'com.jakewharton.timber:timber:4.1.2'

    // Dependency injection
    // http://google.github.io/dagger/
    // Apache 2.0
    compile 'com.google.dagger:dagger:2.2'
    apt "com.google.dagger:dagger-compiler:2.2"

    // Easily use custom typefaces
    // https://github.com/chrisjenx/Calligraphy
    // Apache 2.0
    compile 'uk.co.chrisjenx:calligraphy:2.2.0'

    // HTTP client
    // http://square.github.io/retrofit/
    // Apache 2.0
    compile 'com.squareup.retrofit2:retrofit:2.0.2'
    compile 'com.squareup.retrofit2:converter-gson:2.0.2'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.0.2'
    compile 'com.squareup.okhttp3:logging-interceptor:3.2.0'

    // RX Java  and Reactive Extensions for Android
    // https://github.com/ReactiveX/RxAndroid
    // Apache 2.0
    compile 'io.reactivex:rxandroid:1.1.0'
    compile 'io.reactivex:rxjava:1.1.3'

    // Dependency Injection for Views
    // http://jakewharton.github.io/butterknife/
    // Apache 2.0
    compile 'com.jakewharton:butterknife:8.0.1'
    apt 'com.jakewharton:butterknife-compiler:8.0.1'

    // Form Validation
    // https://github.com/ragunathjawahar/android-saripaar
    // Apache 2.0
    compile 'com.mobsandgeeks:android-saripaar:2.0.3'

    // Crash reporting and analytics
    // https://fabric.io
    // closed source
    compile('com.crashlytics.sdk.android:crashlytics:2.5.6@aar') {
        transitive = true;
    }

    // Seamlessly request runtime permissions
    // https://github.com/bignerdranch/permission-manager
    // Apache 2.0
    compile(name: 'permissionmanager-release-0.2', ext: 'aar')

    // Processing payments through Stripe
    // https://stripe.com
    // closed source
    compile 'com.stripe:stripe-android:1.0.4'

    // Encrypt credit cards for Cayan
    // https://secure.networkmerchants.com/gw/merchants/resources/integration/integration_portal.php#integration_overview
    // closed source
    compile(name: 'payment-gateway', ext: 'aar')

    // Facebook SDK
    // https://developers.facebook.com/docs/android
    // closed source
    compile 'com.facebook.android:facebook-android-sdk:4.13.2'

    // Fancy Password EditTexts
    // https://github.com/lisawray/passwordview
    // Unlicense
    compile 'com.xwray:passwordview:0.1'

    // Annotation-based model creation
    // https://projectlombok.org
    // MIT
    provided "org.projectlombok:lombok:1.12.6"

    compile 'com.google.android.gms:play-services-wallet:8.4.0'

    compile 'com.android.support:appcompat-v7:23.2.1'
    compile 'com.android.support:recyclerview-v7:23.3.0'
    compile 'com.android.support:design:23.4.0'
}