We should do a few things to make new Evergreen source pushes consistent with sourcepush.py -
- Remove sourcepush.py from the repo
- Use .tar.gz instead of .tgz
- Directory should be mongodb-src-r<version> instead of mongodb-<version>
Example old style - http://downloads.mongodb.org/src/mongodb-src-r3.1.3.tar.gz
Example new style - http://downloads.mongodb.org/src/mongodb-src-r3.1.4.tgz?_ga=1.104674176.1058705380.1409693557