Feature/code 128 barcodes (#10)

* - Add a bunch of missing method accessors in the core PDF library
- Removed PDFCode128 class
- Added PDFBarcode class, which incorporates PDFCode128, and now includes Barcode39

* - Update test_pdf128_gen.php to use new class name
- Add test_pdf39_gen.php to produce test output of the Code 39 barcode generation

* Update package name, update homepage URL

composer.json

@@ -1,8 +1,8 @@
 {
-    "name": "docnet/tFPDF",
-    "description": "tFPDF",
+    "name": "docnet/tfpdf",
+    "description": "tfpdf",
     "keywords": ["pdf"],
-    "homepage": "http://github.com/dblencowe/tfpdf",
+    "homepage": "http://github.com/DocnetUK/tfpdf",
     "type": "library",
     "license": "LGPL",
     "authors": [