Merge latest changes in branch 'develop' into feature/nextgen, all changes modified to use namespaces

- added both the original resource and the urldecoded version to the __toString() output
- added a testcase for __toString()

Fix debug component requestbuilder unittest

fix issue #56 add toString method to request

Did require some refactoring of other classes though.
Also implemented dereferencing support in the join helper method.

- updated autoloader for namespaces
- various namespacing fixes

[WIP] Namespaces

The tool used: https://github.com/ralphschindler/PHPTools

The command used:

    $ php ../PHPTools/bin/php-namespacer.php -l=library --output-path=src

add composer.json