* Add support of multiple HMAC keys in WSGI middleware

  this feature allows to change HMAC key without downtime

  e.g.
  1) Add new HMAC key to all services
  2) Switch tool to new HMAC key
  3) Remove old HMAC keys from all services

* Add osprofiler entry point

  We add osprofiler trace trace_id --html/--json command
  that fetches, parse and present trace information.

* Added Docs
  Now you can build docs locally or read them on
  http://osprofiler.readthedocs.org/en/latest/
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