controllers/postmtce
    changed unset($posting['updated']); to $posting['updated']=NULL; so that 
        the database would add the current timestamp to the updated field when
        any changes are being made.
Minor fixes...
views/postedit.php
controllers/postmtce.php
    add cancel button to edit post page
scripts/all_tables.sql
    added current timestamp if value null for posts/updated
views/_template.php
    make title a link to homepage
Merge remote-tracking branch 'origin/pagination' into asgn2-pagination