pulled variables out of var/main.yml into the top level playbooks to make it easier to modify them in a single file.
added cluster name to Travis build
add mapr_version
attempt to remove the travis key before starting
Update README.md
comment out all variables in defaullts/main.yml, forcing the user to
set them explicitly in the top level playbook
Merge pull request #13 from vicenteg/role-variables

Role variables