Fix link to sched.do in app-level sharing message

* Change `https://sched.do` to `https://www.sched.do`

https://trello.com/c/KR3Pm23X
Change name of pow directory in `bin/setup`

* Change dir name from `sched` to `scheddo` to run foreman at `scheddo.dev`

https://trello.com/c/FLtWrKn4
Add yammer_network_name column to users table

* Update #fetch_yammer_user_data to include yammer_network_name
* Update existing user records to include user's Yammer network
* Set default value for yammer_network_name of new users

https://trello.com/c/zRMBjTuO
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