initial setup for creating shared methods between site_credential and shared_credential classes.
removing creds file, renaming to credential
test method working for both site and shared credential classes.
allow site to correctly parse the correct credential object.
clean up and formatting with additional method edit to simplify.
removed added line for testing, and fixed typo.
renamed shared_cred file to full name, shared_credential
remove duplicate attr for username, and alias old userid attr to point to username.
removing commented out attr
rename Type to Service for Credential::Service, added new type PBRUN to ElevationType, changed test method signature to accept siteid.
removing unnecessary initialize method from SiteCredential
Merge pull request #98 from sgreen-r7/master

Refactor/Extract Common Credential Module