Gradle Forge requirements

There is a list of things from Gradle build script necessary for Gradle addon to work:

• project name, version, properties
• dependencies - artifact name, group, version, scope (configuration) and if it's direct or managed (defined in subprojects {})
• repositories - name, url
• applied plugins (and if possible any information about how they are configured)
• source/resource sets

For now Gradle addon will append something like following code to obtain information from Gradle script: https://gist.github.com/adamwy/5909233