Add trove classifiers.

Add trove classifiers for Python 3. This makes <http://py3readiness.org> display the status of this package correctly :).
Merge pull request #72 from vaibhavsagar/patch-1

Add trove classifiers.
1.3.0b2
Increase number of tries and retry interval.

Now for every GET request which fails with error code 449 or 503,
there would be retries after 30, 60, 120, 240 and 480 seconds.
1.3.0
Supporting tags during command creation
Merge pull request #76 from guptavishal/tags

Supporting tags during command creation
1.3.1
QDS SDK command groups and roles
Groups and Roles changes and Unit tests
Squash merge pull request #70 from msumit

Groups and Roles support
Test cases for db import export added
Tags Fixed