shows user's avatar if he or she is a hive's user

If the commit email is one of the hive's user's one, then shows the user's
avatar, otherwise shows the email's gravatar.
changed gravatar's default image to hive's default image
project delete form departed from project setting (HIVE-36)
add active label on create new label
security: add some site admin feature auth check code
fix fileUpload button style (for IE), label style. new milestone form has localized.
feature: add sorted view myproject list in front page
fix CSS/JS for repository URL at project home (HIVE-173)
add JavaScript module for project home
set anchor area on whole .stat-wrap
color style: change color style of markdown & code view