Merge pull request from Joao with multiple commits

 * Implement the Shipment Void action.
 * Save xml request and response messages.
 * Fixed log issues
 * Fixed view issues.
 * Added function field msg_bin to return a binary version of msg.
 * Fixed issue when voiding shipping without packages.
 * Added field insured_value to the ups.shippingregister.package.
 * Added insured_value field to the view.
 * Code clean-up
 * PEP8
 * Fixed alignment issue on the view code.
 * Added the 'Save XML ?' to the company configuration.
Release version 1.1.0
Merge branch 'release/1.1.0'