Grouped all VC++ files together. Added new file extensions and folders used by Visual C++ 2010.

Ignore files generated by OS X that might appear on external disks:
  .Spotlight-V100
  .Trashes

Hopefully comments look better now.

Improved CodeIgniter .gitignore to support an system directory in a different location to the default install. Fixed database.php ignore rule. The application directory can be moved to any location and the ignore will still operate

Removing:
- static/uploaded/**/* since there is no default
  for upload paths (configurable)
- *.mo because it's a best practice to keep them
  close to the po files and update before release
- *.pyc since that's covered by the Python gitignore file

Adding:
- local_settings.py because it's a best practice
  for Django projects (next to settings.py)