Add repository url

[andretietz]

mavelCentral() is not enough.

After adding:

buildscript {
    repositories {
        maven { url "http://dl.bintray.com/davidb/maven/" }
        mavenCentral()
    }
    dependencies {
        classpath "net.alchim31.gradle:gradle-getdown-plugin:0.2.2"
    }
}

it worked (at least the dependency download)

[davidB]

the plugin is available on jCentral() like lot of other gradle plugins. (see README, no need to mavenCentral or my repository, both should be aggregated into jCentral)