Fixed syntax error
Added Unit Tests for Zend_Pdf

Commit Includes:
- PdfTest.php containing unit tests for some methods of Zend_Pdf
- Integration of PdfTest.php in AllTests.php
- PdfWithFields.pdf sample PDF file to assert functionality related to form fields

Tests include unit tests for following methods:
- `Zend_Pdf::getTextFieldNames()`
- `Zend_Pdf::setTextField()`
- `Zend_Pdf::setTextFieldProperties()`
- `Zend_Pdf::markTextFieldAsReadOnly()`
Merge branch 'patch-1' of github.com:stephenorr/zf1 into patch-1