Fixed bug in ProfileInstaller::hookImplementationHasNotBeenInvoked.

 	modified:   ProfileInstaller.php
Fixed bug in ProfileInstaller::alterInstallConfigureForm.
Updated ProfileInstaller::updateHookImplementationStatusToInvoked.

  Hardened and added error handling.
Refactor approach to handling hook_install_tasks_alter().

 	modified:   ProfileInstaller.php
Refactor approach to handling hook_form_install_configure_form_alter.

 	modified:   ProfileInstaller.php
Fixed bug in ProfileInstaller::getHookImplementationForProfile().

 	modified:   ProfileInstaller.php
Fixed bug in ProfileInstaller::alterInstallConfigureForm.

 	modified:   ProfileInstaller.php
Fixed bug in ProfileInstaller::alterInstallTasks.

 	modified:   ProfileInstaller.php
Fixed bug in ProfileInstaller::$hook_invocations

 	modified:   ProfileInstaller.php