Improved on the module installation process.
* CODE_PATH is now absolute.
* Pivip_Utility_Doctrine now extends Vogel_Utility_Doctrine, where the previous functionality of this class moved to.
* Pivip_Utility_Doctrine now includes the updateModels() method, which calls the parent method with the same name. It replaces the default target with one with the CODE_PATH prepended.
* [Imagestream] The installation of this module now makes use of Pivip_Utility_Doctrine::updateModels() so it no longer overwrites table relationships defined by other modules.
* [Imagestream] When retrieving the image stream results in an exception thrown (e.g. because the connection times out) this exception is now caught.
* [Planet] The installation of this module now makes use of Pivip_Utility_Doctrine::updateModels() so it no longer overwrites table relationships defined by other modules.