Exclude MANIFEST.MF files from rat check

MANIFEST.MF files cannot have comments. Hence, I suggest that they be globally ignored by the rat check plugin by adding the following like to the UIMA parent POM:

<exclude>**/*/MANIFEST.MF</exclude> <!-- MANIFEST.MF files cannot have comments -->

Source: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4782054
Source: http://litrik.blogspot.de/2007/08/comments-in-manifestmf.html