This commit migrates tk-auth to using clj-parent version 0.3.3 for its
dependencies. This commit also updates the i18n plugin dependency from
0.4.3 to 0.6.0 for compatibility with the version of i18n being
inherited from clj-parent. This commit also upgrades the lein version
to 2.7.1 in the .travis.yml file since 2.7.1 is the minimum version
required for compatibility with lein/clj-parent.
