TF Android Example compile warning fixes

1. The minSdk and targetSdk version should not be declared in the android manifest file. You can move the version from the manifest to the defaultConfig in the build.gradle file.
Reference : https://developer.android.com/guide/topics/manifest/manifest-intro#uses-sdk
2. Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
Reference : http://d.android.com/r/tools/update-dependency-configurations.html
3. Caused by: java.io.FileNotFoundException: imagenet_comp_graph_label_strings.txt this error reported after application compile and run first time using Studio, this fix solves the exist problem.