Merge pull request #45 from deshipu/master

A 'clear cache' button in reports
Add pricing_center and business_segment fields in Venture
Update models.py
Merge pull request #46 from quamilek/dev

Add pricing_center and business_segment fields in Venture
Documentation skeleton
Merge branch 'dev' of github.com:quamilek/ralph_pricing into dev
Documentation for Openstack, Splunk plugins
Merge pull request #47 from quamilek/dev

Documentation skeleton
fix docs literal style