Changes allow for the editing of the logged in user's gists.
Currently will only allow you to change the title, teaser and blog content.
A modal pops out like the creation of a gist, but will populate those fields
with the existing content.
Currently everything is sent as an update to github.
A check should probably be made to see what has changed and to only
send those changes.
Username will need to be checked to not allow logged in users to see
an edit link on other's pages.