Add uservoice-php sdk as submodule
Add oauth and mcrypt PHP modules
Revert "Add uservoice-php sdk as submodule"

This reverts commit 2566f9cd9532d5409b1beb8a415c4c389503d2aa.
Get uservoice sdk installed via composer

- Add prerequisite php modules
- Enable modules in both php.ini files (for apache & cli)
- Install composer
- Create composer.json