Merge branch 'integ-windows-test' into develop

* integ-windows-test:
  Switch double quotes to single quotes
  Skip symlink tests on windows
Switch skip condition for symlink tests to check if windows

python3.3 has os.symlink on windows, but we still want to skip this
test.
Don't require s3:// prefix on ls commands

The path will always refer to an s3 object,
so it's not necessary to specify s3://.  Now
we support both versions:

* aws s3 ls s3://bucket-name
* aws s3 ls bucket-name