Merge branch 'release-2.9.3' into develop

* release-2.9.3:
  Bumping version to 2.9.3
Started the 2.9.4-dev cycle.
Fixed up a test failure in the DynamoDB suite.
Add Released: prefix for date in README
Made the release & date line up again.
change os.path.normpath to posixpath.normpath because on windows os.path.normpath converts forward-slashes to backward-slashes
Added pypi downloads badge.
Merge pull request #1498 from astupidog/develop

Changed usage of ``os.path.normpath`` to ``posixpath.normpath`` for support on Windows.
Started the release notes for 2.9.4.
Adjust part size as needed in create_archive_from_file

Fixes #1478, original patch suggested by @dminkovsky.
If we have a large enough file such that the default part size
is not sufficient to stay within the maximum number of parts
allowed by glacier, we automatically adjust the part size
to the minimum required.  We were previously calculating this
value but not actually doing anything with it.
Add release note item for bug fix
Merge branch 'glacier-partsize-fix' into develop

Closes #1478

* glacier-partsize-fix:
  Add release note item for bug fix
  Adjust part size as needed in create_archive_from_file
Fixed regex that failed on S3 buckets with uppercase letters.
Merge pull request #1503 from reinhillmann/develop

Fixed regex that failed on S3 buckets with uppercase letters.
A few PEP8 fixes and added some missing files to the EC2 ref docs index.
Merge branch 'develop' of github.com:boto/boto into develop
Fixing cloudformation time stamps when API returns milliseconds
Added tests for the cloudformation millisecond bug.
Merge branch 'cloudformation-millis' into develop
Finalized release notes for v2.9.4.