Added httpsRedirect param for load balancer 

**Issue:** https://github.com/rackspace/pyrax/issues/277

Added **httpsRedirect** param to load balancer *client* and *manager*.
Updated unit tests.
Ran nosetests -w tests/unit, all tests pass.
Ran pep8 -r --show-source --max-line-length=84 \ --ignore=E123,E124,E126,E127,E128,E303,E302 pyrax/
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