Merge branch 'develop' of github.com:osmlab/maproulette into develop

* 'develop' of github.com:osmlab/maproulette:
double loading of challenge stats
skipping 'present challenge' dialog when returning from stats pages
fix the flow when returning to main window
reinstating nevermind (fixes #142)
circumventing weird routing issue by adding /random
Merge pull request #145 from mvexel/develop

fixing remaining critical bugs for 2.0 release part 1 (#132)