adding Dockerfile changes to xlarge

Merge pull request mongodb#154 from mongodb/layer-update

update

Merge pull request mongodb#140 from mongodb/stage

Stage

Merge pull request mongodb#104 from madelinezec/stage

lint stage before merge to master

Merge pull request mongodb#80 from mongodb/kanopy-fixes

fixes

Merge pull request mongodb#73 from mongodb/stage

Stage

Merge pull request mongodb#61 from mongodb/stage

Dochub and new Dockerfile changes