D.R.Y. - Reuse Gradle repository definition

D.R.Y. - Reuse Gradle repository definition

This works however:

#### build.gradle
```gradle
buildscript { 

    // Repository Configuration
    ext.repos = {
        mavenCentral()
        maven { url 'https://repo.spring.io/milestone' }
        maven { url 'https://plugins.gradle.org/m2/' }
    }

    repositories repos

    dependencies {
        . . .
    }
}

// Local
repositories repos

// Global
allprojects {
    repositories repos
}
```