Rename and Re-RDNN to Contacts

[ryonakano]

Fixes #9

user@elementary-daily:~/work/friends (master =)$ git ls-files *friends* | while read line; do git mv $line ${line//friends/contacts}; done
user@elementary-daily:~/work/friends (master +=)$ git grep -wl friends | xargs sed -i "s/friends/contacts/g"
user@elementary-daily:~/work/friends (master *+=)$ git grep -wl Friends | xargs sed -i "s/Friends/Contacts/g"
user@elementary-daily:~/work/friends (master *+=)$ git checkout -- po/*.po*
user@elementary-daily:~/work/friends (master *+=)$ git checkout -- po/extra/*.po*
user@elementary-daily:~/work/friends (master *+=)$ git grep -l io.elementary.friends | xargs sed -i "s/io.elementary.friends/io.elementary.contacts/g"

TODO

• Rename the repository: needs to be done by a repository admin
• Rename Weblate project