provision/docker: deploy dockerfile. Related to #1314
provision/docker: deploy dockerfile. Related to #1314

Now we support deploy a Dockerfile in app deploy. Users should send a
build flag with deploy url and tsuru will build an image based on Dockerfile, after
that deploy continues with this image.

gwmoura/tsuru,ggarnier/tsuru,guilhermebr/tsuru,gwmoura/tsuru,tsuru/tsuru,tsuru/tsuru,ggarnier/tsuru,guilhermebr/tsuru,cezarsa/tsuru,ggarnier/tsuru,tsuru/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,gwmoura/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,ArxdSilva/tsuru,tsuru/tsuru,guilhermebr/tsuru,cezarsa/tsuru