Adds the missing install-ivy build script

.gitignore

@@ -2,6 +2,10 @@
 out/
 *.ipr
 *.iws
+classpath.txt
 version.properties
+.project
+.classpath
 lib/*
-build/*
+build/*
+generated-files/*

README.md

@@ -14,6 +14,8 @@ You need the following installed and available in your $PATH:
 
 <li>- Apache ant 1.7 or greater (http://ant.apache.org/)
 
+<li>- Scala 2.x or greater (http://www.scala-lang.org/downloads)
+
 ### To build the codegen library
 If you don't have the Apache Ivy dependency manager installed, run this build script:
 

install-ivy

@@ -0,0 +1,30 @@
+<project name="install-ivy" xmlns:ivy="antlib:org.apache.ivy.ant" default="init-ivy" basedir=".">
+    <property name="ivy.install.version" value="2.1.0-rc2" />
+    <condition property="ivy.home" value="${env.IVY_HOME}">
+      <isset property="env.IVY_HOME" />
+    </condition>
+    <property name="ivy.home" value="${user.home}/.ant" />
+    <property name="ivy.jar.dir" value="${ivy.home}/lib" />
+    <property name="ivy.jar.file" value="${ivy.jar.dir}/ivy.jar" />
+
+    <target name="download-ivy" unless="offline">
+
+        <mkdir dir="${ivy.jar.dir}"/>
+        <!-- download Ivy from web site so that it can be used even without any special installation -->
+        <get src="http://repo2.maven.org/maven2/org/apache/ivy/ivy/${ivy.install.version}/ivy-${ivy.install.version}.jar" 
+             dest="${ivy.jar.file}" usetimestamp="true"/>
+    </target>
+
+    <target name="init-ivy" depends="download-ivy">
+      <!-- try to load ivy here from ivy home, in case the user has not already dropped
+              it into ant's lib dir (note that the latter copy will always take precedence).
+              We will not fail as long as local lib dir exists (it may be empty) and
+              ivy is in at least one of ant's lib dir or the local lib dir. -->
+        <path id="ivy.lib.path">
+            <fileset dir="${ivy.jar.dir}" includes="*.jar"/>
+
+        </path>
+        <taskdef resource="org/apache/ivy/ant/antlib.xml"
+                 uri="antlib:org.apache.ivy.ant" classpathref="ivy.lib.path"/>
+    </target>
+</project>