#4 package-info.java is unsupported

[Oliver Kopp]

JavaDoc recommends to use package-info.java files to put general information on a package:
http://docs.oracle.com/javase/7/docs/technotes/tools/solaris/javadoc.html#packagecomment

These files confuse plantuml-dependency and raise an exception.
(The java type can't be extracted from the content "package mypackage;")

The work around is to add "-e **/package-info.java" to the command line. It would be nice, however, if plantuml-dependency would be able to deal with such files by itself.