No validity checking on extra information

Maybe we could have predefined types so that the author doesn't have to worry about the details of formatting, like the html5 values for the 'type' attribute for the <input> tag, e.g. "email", "url", "date", etc...

   information-type=email
   information-type=url
   information-type=date

Some of the types could then allow the accomplishments-viewer to display them based on the client's localization settings.

If there's something the accom creator wants that doesn't fit one of the predefined types, they could define its formatting with a regex:

   information-type=custom
   information-format=^[0-9]{1}[A-Z]{3}[0-9]{3}$

Some work went on a while back into providing an example of what the information should look like, and we discussed using a regex approach to solve this problem. My hunch is that the regex approach would be best. Thoughts?

One other note: accomplishment authors would not need to know the regex details as we keep the different types of information known by Ubuntu Accomplishments in https://launchpad.net/ubuntu-accomplishments-extra-information and the author just copies the relevant file into their collection.

The daemon already exposes regex data for each bit of extra-information (if available). Therefore all that has to be done to fix this is add code to viewer's credentials edition window which will check if typed in value matches the regex.

This task may be recommended for a new contributor who is familiar with python, marking as bitesize.