Merge pull request #19 from lrakhman/omniauth_fitbit

Omniauth fitbit
added email functionality
Merge branch 'master' into omniauth_fitbit
add challenges view for challenges started by others and nonsensical commit message
not much
Merge pull request #20 from lrakhman/challenge_notifications

add challenges view for challenges started by others and nonsensical com...
untracked tmp files