Merge branch 'release-0.48.0' into develop

* release-0.48.0:
  Bumping version to 0.48.0
  Update models to the latest version
Support python3.4

There was a fix needed for python3.4.1,
as shown in https://github.com/boto/botocore/pull/297

This also updates travis/tox to run tests against py3.4

Also verified the CLI tests pass.
Merge branch 'py34' into develop

* py34:
  Support python3.4
Bumping version to 0.49.0
Merge branch 'release-0.49.0'

* release-0.49.0:
  Bumping version to 0.49.0
  Support python3.4