Merge pull request #129 from mvexel/develop

removing ?all=true from challenges
Merge pull request #139 from mvexel/develop

fixing both josm and id edit uris. fixing stats
Merge pull request #140 from mvexel/develop

adding basic statistics
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