Reorganize project

- modularized
- change pdfbox version to latest 1.8.x relase, so it match now the
mustang sample

src/test/java/pdfa3/TestPDFA3.java

@@ -1,30 +0,0 @@
-package pdfa3;
-
-import org.junit.Test;
-
-import pdfbox.PDFA3File;
-import pdfbox.PDFA3FileAttachment;
-import pdfbox.PDFAFile;
-
-public class TestPDFA3
-{
-
-  @Test
-  public void testPDFA3File()
-  {
-    PDFA3File.main(new String[] { "PDFA3File.pdf", "Messsage" });
-  }
-
-  @Test
-  public void testPDFA3FileAttachment()
-  {
-    PDFA3FileAttachment.main(new String[] { "PDFA3FileAttachment.pdf", "Messsage" });
-  }
-
-  @Test
-  public void testPDFAFile()
-  {
-    PDFAFile.main(new String[] { "PDFAFile.pdf", "Messsage" });
-  }
-
-}