Admin status

Adds row, weather observation and census block counts to admin edit dataset (#162)

![screen shot 2014-12-09 at 9 18 22 am](https://cloud.githubusercontent.com/assets/919583/5359668/b5be02d6-7f84-11e4-9806-071a1b656233.png)

Displaying ETL status and audit log of tasks in admin section

![screen shot 2014-12-09 at 9 18 31 am](https://cloud.githubusercontent.com/assets/919583/5359679/c4bace04-7f84-11e4-9207-185b53bd1236.png)

Closes #148
Closes #161 
Closes #162
Closes #157