Add metadata header to final output

[rodrigosiqueira]

Kuniri already extracts a lot of information about each file, but not save it on the output. It is really useful if it keeps this information at the beginning or and of the xml file.

Follow a suggestion (feel free to change it):

<?xml version="1.0" encoding="UTF-8"?>
<kuniri>
  <info>
    <originalFile value="/path/to/file"/>
    <fileName value="lala"/>
    <loc value="32"/>
    <totalClass value="3"/>
    <totalFunctions value="4">
  </info>
  <classData name="Lala" visibility="public">
  </classData>
</kuniri