tsuru: added travis-ci ribbon and go 1.1 into travis.yml.

Signed-off-by: Francisco Souza <fss@corp.globo.com>
readme: fixed build status @ travis-ci.

Signed-off-by: Francisco Souza <fss@corp.globo.com>
readme: added droid ribbon.

Signed-off-by: Francisco Souza <fss@corp.globo.com>
travis: fix build steps

Merge #461.