fix computation of the extension of unpacked artifacts


git-svn-id: https://svn.apache.org/repos/asf/ant/ivy/core/trunk@1555476 13f79535-47bb-0310-9956-ffa450edef68
embrace java 5


git-svn-id: https://svn.apache.org/repos/asf/ant/ivy/core/trunk@1555477 13f79535-47bb-0310-9956-ffa450edef68
remove duplicate log


git-svn-id: https://svn.apache.org/repos/asf/ant/ivy/core/trunk@1555478 13f79535-47bb-0310-9956-ffa450edef68
add support for source artifacts in buildobr task


git-svn-id: https://svn.apache.org/repos/asf/ant/ivy/core/trunk@1555479 13f79535-47bb-0310-9956-ffa450edef68
fix doc


git-svn-id: https://svn.apache.org/repos/asf/ant/ivy/core/trunk@1555480 13f79535-47bb-0310-9956-ffa450edef68