Make ArrayHelperTest resilient against undefined sort order

The documentation of usort (http://us1.php.net/manual/en/function.usort.php)
makes it clear that "If two members compare as equal, their relative order in the sorted array is undefined."
Updating Readme
corrections to update
Remove PHP 5.3.6 check from MySQL database driver
Merge pull request #290 from mbabker/mysqlDSN

Remove PHP 5.3.6 check from MySQL database driver
README updates
Merge pull request #291 from mbabker/README

README updates
Deprecate PostgresqlDriver::test()
Cleanup based on phpdoc output and file review
Merge pull request #293 from mbabker/review

Cleanup based on phpdoc output and file review
Test XML String equivalency, not simple string equality
Merge pull request #292 from mbabker/pgsqlTest

Deprecate PostgresqlDriver::test()
Add docs to Github; light refactoring; bug fixes.

* Rename `Package` and `GithubObject` classes to `AbstractPackage` and
`AbstractGithubObject` respectively.
* Deprecated `Package` and `GithubObject` classes.
* Fix bug in create tag API.
* Fix bug in `Teams::chekRepo` API (missing repo owner name - this is
technically not backward compatible, but the old method would not
anyway)
* Added support for releases.
* Added more examples to documentation.
Merge pull request #294 from okonomiyaki3000/test_xml_string

Test XML String equivalency, not simple string equality
Fix merge conflict.
Add note about @since tags.
Merge pull request #298 from eddieajau/Contributing

Add note about @since tags.
Removed stray file.
Merge pull request #287 from piotr-cz/docs_Registry

Docs about using XML with Registry
Extra docs for Registry

Supplements the XML import docs for the Registry class.