Admin styles and stability

• Fixed: Improper enqueue in tracking class.
• Fixed: Few classes missed for various fields.
• Fixed: Spacing field kicking back notices and warnings when 'output' wasn't set.
• Modified: Added file_exists check to all include lines in framework.php
• Fixed: Background field now works with dynamic preview as it should.
• Fixed: Extension fields now enqueueing properly.
• Added: Text-align to typography field.
• Fixed: Servers returning forwards slashes in TEMPLATEPATH, while Redux is installed embedded would not show options menu.
• Fixed: On and Off for switch field not displaying language translation.
• Fixed: email validation allowing a blank field.
• Fixed: Now allow for empty values as valid keys.
• Added: Dismiss option to admin notices (internal function)