docs/releases/tsr/0.6.0: add release note regarding team owner

Related to #698.
api: require tsuru 0.11.0 (to be released)
api: require tsuru-admin 0.5.0 (to be released)
requirements: add sphinx-rtd-theme
docs/releases: add release notes for tsuru 0.11.0
cmd/tsuru-base: use template instead of Sprintf in app-info
cmd/tsuru-base: display the team owner in the output of app-info
docs/releases/tsuru/0.11.0: app-info now displays the team owner