Adding repository to parent pom

When deploying artifacts to a specified repo.url, dependent dependencies ( compatibility-v7-mediarouter dependeing on compatibility-v7-appcompat ) reference http://repo.maven.apache.org/maven2 instead of the repository that was specified ( see maven error below ).

```
[ERROR] Failed to execute goal on project compatibility-v7-mediarouter: Could not resolve dependencies for project com.simpligility.android.sdk-deployer:compatibility-v7-mediarouter:apklib:2.4.0: The following artifacts could not be resolved: android.support:compatibility-v7-appcompat:apklib:19.0.0, android.support:compatibility-v7-appcompat:jar:19.0.0: Could not find artifact android.support:compatibility-v7-appcompat:apklib:19.0.0 in central (http://repo.maven.apache.org/maven2)
```

The Readme was also updated with the command to pass the repo.url in when deploying so that you don't have to modify the pom and have possible merge conflicts when pulling in the new changes.