Merge pull request harness#1600 from bradrydzewski/master

bump docker version to 0.4.2 in preparation for 0.5

updated docs

Merge pull request harness#1237 from pheuter/patch-1

When cloning pull requests, use specific branch

Merge pull request harness#1204 from kpacha/fix_marathon_upgrade

Marathon: fix the curl construction

alpha version 0.2.1

version 0.2.0