Added Gradle 2.1

<?xml version="1.0"?>
<interface xmlns="http://zero-install.sourceforge.net/2004/injector/interface" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://zero-install.sourceforge.net/2004/injector/interface http://0install.de/schema/injector/interface/interface.xsd http://0install.de/schema/desktop-integration/capabilities http://0install.de/schema/desktop-integration/capabilities/capabilities.xsd">
  <name>Gradle</name>
  <summary xml:lang="en">A software project management and comprehension tool</summary>
  <summary xml:lang="de">Ein Softwareprojeketmanagementwerkzeug</summary>
  <homepage>http://www.gradle.org/</homepage>
  <category>Development</category>
  <needs-terminal/>
  <feed-for interface="http://0install.de/feeds/Gradle.xml"/>
  <group langs="en" license="The Apache Software License, Version 2.0">
    <environment mode="append" name="GRADLE_OPTS" value=""/>
    <environment insert="" mode="replace" name="APP_BASE_NAME"/>
    <command name="run">
      <runner command="java" interface="http://repo.roscidus.com/java/openjdk-jdk">
        <arg>$GRADLE_OPTS</arg>
        <arg>-Dorg.gradle.appname=$APP_BASE_NAME</arg>
        <arg>-classpath</arg>
        <arg>org.gradle.launcher.GradleMain</arg>
      </runner>
    </command>
    <implementation id="sha1new=6e1a9ee8a4e869d0aa0165532ee310ffc0974e10" released="2014-11-08" stability="stable" version="2.1">
      <manifest-digest sha256new="QEQP6AXSJ5GTRH6PE5KHI237AKMPMHWTTNOM7G53MMCXARSTNLPQ"/>
      <archive extract="gradle-2.1" href="https://services.gradle.org/distributions/gradle-2.1-bin.zip" size="41540840" type="application/zip"/>
    </implementation>
  </group>
</interface>