Travis CI: Bump Bazel version to 0.7.0.
Travis CI: Bump Bazel version to 0.7.0.

googlei18n/language-resources,google/language-resources,googlei18n/language-resources,google/language-resources,googlei18n/language-resources,googlei18n/language-resources,google/language-resources,googlei18n/language-resources,googlei18n/language-resources,google/language-resources,google/language-resources,google/language-resources