Fixes #374

Changes:
- Implementation of `setJavaScript()` and `getJavaScript()` added for manipulating document-level JavaScript.
- Additionally, `resetJavaScript()` and `addJavaScript()` methods added.

See the docblocks for all four methods for the description of their operations.

#374 fixed.
Added Unit tests for Zend_Pdf

Unit tests include:
- Zend_Pdf::getJavascript()
- Zend_Pdf::setJavascript()
- Zend_Pdf::resetJavascript()
- Zend_Pdf::addJavascript()

Added Zend_PdfTest test suite to AllTests.php
Serialized DateTime includes fractions of seconds since 5.6.0beta4
Method names fixed for Zend_PdfTest
Fixes #390 - Zend_Locale_Format::_getEncoding() is missing a return statement
Merge pull request #385 from mhujer/datetime56

Serialized DateTime includes fractions of seconds since 5.6.0beta4
Fixes DocBlock for Zend_Locale_Format::_setEncoding()
Merge pull request #375 from adeelnawaz/master

Fixes #374 - Implement Zend_Pdf::getJavascript() and Zend_Pdf::setJavascript()
Minor CS fixes in Zend_Pdf
Added release notes to README.md
Updated .travis.yml - ignore 5.6 failure (waiting for next PHP 5.6 beta/RC)