Fix incorrect disk_info usage of API and ApiWrapper classes

Fix the usage of the Geometry structure from struct.rb as well
as call to the get_info method in the api.rb - both in the API class.

Increment the version of the gem to 1.0.1 due to this change.
Update version.rb
Merge pull request #6 from jerryk55/fix_disk_info_wrapper_class_issues

Fix incorrect disk_info usage of API and ApiWrapper classes