allow using Piwik when installed as a Composer dependency #173

Could you explain the exact workflow you are using?

What is the error if you don't make these changes?

@mattab We had a discussion in IRC about this - the idea is to install Piwik as a composer dependency. The check in Piwik whether all composer dependencies are installed fails since the dependencies aren't in Piwik root dir when Piwik is required as dependency. Error that occurs is that Piwik displays the message to install the composer dependencies..

@craue I haven't tested this use case but I trust you have.. thanks

With this, Piwik can be installed by just calling php composer.phar require piwik/piwik:~2.0 within a project. All that's left to do is adding an Apache alias (or similar) pointing to vendor/piwik/piwik. It used to work quite well with 1.12 already.