Reorganizing code for readability.

 	modified:   ProfileInstaller.php
Removed unused method, ProfileInstaller::installProfilesIncludedByProfile.
Updated ProfileInstaller::setInstallCallbacks.

  Improve readability. Remove duplicative code.
Removed unused variables from ProfileInstaller::getIncludedProfiles.
Updated documentation and code organization for readability.
Fixed minor bug introduced by reorganization.

 	modified:   ProfileInstaller.php