Moved auth_type and privacy_type

Moved auth_type and privacy_type to SharedCRedentialSummary Class
Removed cred.auth_Type and cred.privacy type

Removed cred.auth_Type and cred.privacy type from self.from_json
Update shared_cred.rb
include engine scope attribute in list_engines
Merge pull request #77 from gschneider-r7/master

include engine scope attribute in list_engines
Merge pull request #75 from krankin-r7/master

Removed attributes from from_json method
Bumping version number in preparation for release.
Remove 'rex' (we just need librex), add Brandon
Fix a bug in silo_profile xml where scan engines are populated with report templates
Merge pull request #81 from gschneider-r7/silo-profile-fix

Fix a bug in silo_profile xml
Filling in the empty space with a comment hash.
Incorporating migration from librex to rex.

Also bumping the version for the next release.
Implement experimental export_scan method.
Implements experimental scan import feature.
Adds permission checking to export_scan method.

Returns an explict PermissionError on a 403 response. Otherwise,
raises an APIError. (Typically on a 500 response.)
Adds permission checking to import_scan method.

Raises an explicit PermissionError on 403 response. Raises an APIError
on a 500 response (which is the typical behavior of a failure at this
time).
Site#parse no longer depends on SiteConfigResponse

Remove absolute xpath expectation, so that XML can be parsed if pulled
in from other places (such as exporting Site#to_xml).
Add methods to alter scan threads in scan_template.rb
Merge pull request #82 from abunn-r7/master

Add methods to alter scan threads in scan_template.rb
Updates calls for dynamic sites.

This should address issues #71 and #83
The underlying calls were changed.
This currently is only set to work for vSphere.