Update dependences of appauth-android_codelab_init

[davidmigloz]

• AppAuth 0.2.0 -> 0.2.0
• Support Lib 23.3.0 -> 27.1.1
• Okhttp 3.2.0 -> 3.10.0
• Picasso 2.5.2 -> 2.71828

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• Gradle 2.10 -> 4.6
• Android Gradle Plugin 2.1.0 -> 3.1.1

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• compileSdkVersion 23 -> 27
• targetSdkVersion 23 -> 27
• buildToolsVersion 23.0.2 -> 27.0.3

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[davidmigloz]

I signed it!