Devbootcamp/Phase_0_App — pull request #19 by toreyhickman (2013-11-26 14:55:20+00:00)
Title: Challenges Due Bug Fix

During Week 1 of Phase 0, no challenges are due. The calculation for due challenges was returning nil, which through off calculating whether or not the student was on track.

```ruby
@weeks[0..-2].map(&:challenges).reduce(&:+) # returns nil if @weeks is an array with zero or one elements
```