Added functions to get lists of providers in config file.
Merge pull request #270 from mfalesni/provider_listings

Functions to list the providers.
Added new docs section
Merge pull request #273 from psav/docs

Added new docs section
Moved web_ui module docs
Merge pull request #278 from psav/docs

Moved web_ui module docs
Add cloud provider discovery and doc update
Merge pull request #279 from weissjeffm/provider
Additonal file needed for 'cfme.cloud' docs to work

re #279