add CR in C++ gitignore

And try if I can commit.
Merge branch 'master' of github.com:gogits/gogs
add avatar inorder to view code on github
fix download part problem, add png support
append route to web
rollback conf/app.ini
Merge branch 'master' of github.com:shxsun/gogs
update default image
merge with branch master
Merge pull request #32 from shxsun/master

finish gravatar module