Polish off the cnSEO class.

Closes gh-126
Add settings to allow user to set SEO options.
Added support for using the entry bio and category excerpt as the page meta desc.

Closes gh-181
Closes gh-180
Closes gh-173
Allow vCards to be downloaded via SSL.

Closes gh-165
Roles settings should not reset.

Closes gh-109
Closes gh-26
Start work to  add ability to remove link assigned to an image.
Closes gh-125
Change lang folder name to languages.

Update files path for text domain.
Move the admin pages to the includes folder.
Move class.message,php to admin folder.
Move class.filesystem.php to admin folder.
Move class.capabilities.php to admin folder.
Move class.admin-actions.php to admin folder.
Move CSS and JS and images to assets folder.
Move inc.processes.php to admin folder.
Fix filter by character and pagination to use the admin action class.
Move screen-options.php to the libraries folder.
Move php_class_upload and timthumb to the libraries folder.
Ad the cnEmail and cnEmail_Template classes. Register the default templates.

Closes gh-137