Portfolio items shouldn't be available to shown in nav menus.
Update textdomain to 'custom-content-portfolio'.
Clean up the function names.  Organize things.  Add the translation files.
Add the license.txt.
Long description for the main plugin file.
The readme is ready to go.
A couple of fancy screenshots.
Minor rearrangement of code and inline doc update.
Update the readme.txt to include credit to WooThemes for their folder icon.
Version bump to 0.1.