Updated documentation of the shadow test.  Make it clear that
implementations are not allowed to use any source of information
other than /etc/shadow.  Also added reference to man page
shadow(5).
Merge pull request #145 from chisholm/master

Updated documentation of the shadow test.
removing some smart quotes and long hypens.
Merge branch 'master' of https://github.com/OVALProject/Language
reverting changes to the unix-def:shadow_test pending further community discussion. #49.
reverting changes to the unix-def:password_test pending further community discussion. #49.
closes #103.
removing the enumeration restriction for the sol-def:smf_test protocol entity. closes #106.
merging in Mike's documentaion update for managed_entity_type behavior. Closes #112.
Merge remote-tracking branch 'upstream/master' into iss110