Reformat time and distances

* Add estimated finish time

https://trello.com/c/SV67X6lC/64-add-estimated-finish-time-and-reformat-all-time-distances

![reformat time and distances](https://cloud.githubusercontent.com/assets/3759510/5270732/b417da40-7a3b-11e4-9277-eccf30cba198.png)


Can you rename to `convertToMiles`. Can you also extract the magic number `MILES_PER_METER = 0.000621371`?