Adding REST API application skeleton based on pecan/wsme

* Adding required dependencies to use and test pecan/wsme app
* Adding additional modules from oslo-incubator
* Adding configuration files mistral.conf and specific file
 loggin.conf for logging
* Adding dependencies for testing: fixtures, testtools, mock
* Updating tox.ini to run nosetests for py26 and py27 environments

Change-Id: I4fd63820aaaf3b50fb1c981031f60faa68a6d307