Summary:
The support libraries where out of sync between the projects, causing
the sample build to fail with
```
> Android dependency 'com.android.support:appcompat-v7' has different version for the compile (26.1.0) and runtime (27.1.1) classpath. You should manually set the same version via DependencyResolution
```
This makes sure that the sample submodule uses the top-level
dependencies and same versions.
Closes https://github.com/facebook/Sonar/pull/77
Reviewed By: emilsjolander
Differential Revision: D8447186
Pulled By: passy
fbshipit-source-id: e391501edd97fdbe6456b32cd7305d8be26e20db
e820beba83