Prepare project for first release

Add Composer and Phing metadata to prepare for first release.

Please review: @ahoffmann

build.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project name="uw-php-security" default="main">
 
+    <property name="build.workingDirectory" value="${project.basedir}" />
     <property name="composer.version" value="1.1.3"/>
+    <property name="git.upstream" value="git@git.doit.wisc.edu/adi-ia/uw-php-security.git" />
+    <property name="release.targetDirectory" value="${project.basedir}/target" />
+    <property name="release.version" value="false" />
 
     <!-- Default build target -->
     <target name="main" description="Default build target">
@@ -47,4 +51,21 @@
         </if>
     </target>
 
+    <target name="release">
+        <if>
+            <isfalse value="${release.version}" />
+            <then>
+                <fail msg="release.version property must be set" />
+            </then>
+        </if>
+
+        <property name="build.workingDirectory" value="${release.targetDirectory}" override="true" />
+        <delete dir="${build.workingDirectory" quiet="true" />
+        <gitclone repository="${git.upstream}" targetPath="${build.workingDirectory}" />
+        <phingcall target="test" />
+        <gittag name="${release.version}" repository="${release.targetDirectory}" />
+        <gitpush repository="${release.targetDirectory}" refspec="${release.version}" />
+        <delete dir="target" quiet="true" />
+    </target>
+
 </project>