summarize hours for milestone page

Just a basic display of hours estimated (remaining and total) and completed
for all the items in the milestone.
remove some stray curly braces
let's stick with fullnames for users
Merge pull request #62 from thraxil/fullnames-for-group-members

let's stick with fullnames for users
Merge pull request #61 from thraxil/user-items-table-fix

remove some stray curly braces
Merge pull request #58 from thraxil/milestone-summaries

summarize hours for milestone page