Upgraded Savon Savon to 2.2

The changes includes:
 * Removed global Savon configuration
 * Configurated client with NNE timout config
 * Rename actions from camel cased strings to
   snake cased symbols.
 * Renamed request method to call and configured
   to new way of passing body and attributes.
Added possibility to configure NNE client logging
Update the README
Merge pull request #1 from anderslime/upgrade-savon

Upgrade Savon to 2.2