Consider changing from Maven to Gradle

[awvalenti]

Check if could publish on Maven Central repository even if using Gradle

[awvalenti]

Gradle seems to allow hiding implementation classes, like in the following example:

dependencies {
    // This dependency is exported to consumers, that is to say found on their compile classpath.
    api 'org.apache.commons:commons-math3:3.6.1'

    // This dependency is used internally, and not exposed to consumers on their own compile classpath.
    implementation 'com.google.guava:guava:22.0'

    // Use JUnit test framework
    testImplementation 'junit:junit:4.12'
}