TODID a TODO

(also removed some unused variable names)
Test the google timespan formatter
Move a TODO into an issue [#150]

https://github.com/calagator/calagator/issues/150
Just remove a TODO

If it hasn't come up then it's YAGNI. If it does come up, there won't be
any need for a TODO comment to tell you it's not working :)
Remove a TODO

I don't know if we want to keep providing this. Why wouldn't we, though?
Remove a TODO and unnecessary conditional

abstract_location indeed can't be blank. This code is only called if
it's at least truthy; see models/event.rb.

(Also removed some commented-out code that created a false positive in
my grepping...)
Merge pull request #151 from AndrewLorente/alorente/no-more-todos

Remove various TODOs