Remove Bazel 0.4.4 from supported versions
Remove Bazel 0.4.4 from supported versions

Summary:
Bazel 0.4.4 now emits the following error during a build:

```
ERROR: tools/cpp/clang_configure.bzl:777:15: unexpected keyword 'environ' in call to repository_rule(implementation: function, *, attrs: dict or NoneType = None, local: bool = False)
ERROR: package contains errors: kythe/data
ERROR: error loading package '': Extension file 'tools/cpp/clang_configure.bzl' has errors
```

Reviewers: salguarnieri, #core_team, fromberger

Reviewed By: #core_team, fromberger

Subscribers: fromberger, #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1513

bzz/kythe,benjyw/kythe,kythe/kythe,benjyw/kythe,legrosbuffle/kythe,kythe/kythe,kythe/kythe,legrosbuffle/kythe,benjyw/kythe,benjyw/kythe,bzz/kythe,kythe/kythe,bzz/kythe,kythe/kythe,benjyw/kythe,legrosbuffle/kythe,legrosbuffle/kythe,bzz/kythe,kythe/kythe,legrosbuffle/kythe,benjyw/kythe,bzz/kythe,bzz/kythe,legrosbuffle/kythe,benjyw/kythe,legrosbuffle/kythe,benjyw/kythe,bzz/kythe,bzz/kythe,bzz/kythe,kythe/kythe,bzz/kythe,kythe/kythe,kythe/kythe,benjyw/kythe,legrosbuffle/kythe,legrosbuffle/kythe,bzz/kythe,benjyw/kythe,kythe/kythe,bzz/kythe,benjyw/kythe,legrosbuffle/kythe,kythe/kythe,benjyw/kythe,legrosbuffle/kythe