Added 2 new routes to output user data with date range

Can now select date ranges for data.

Login and get a device id from list (_id):
http://localhost:3000/users/devices

The visit here and replace the **ID** with id from above:
http://localhost:3000/users/devices/data/**ID**/2013-04-15/2013-04-20/ 

First date is the "from date", second is the "to date"

You can also request from a specific date to current date by requesting
http://localhost:3000/users/devices/data/**ID**/2013-04-15/

Or from the beginning to an end date
http://localhost:3000/users/devices/data/**ID**/-/2013-04-20/

NOTE: To select from beginning to end, replace the "from date" with a dash.