remove hardcoded_aliases_* for ldap zimbraAlias check
fix minor issues with zimbraAlias casing. Matches production LDAP better now
#98 separate ldap search logic into separate function
closes #98, provisioning of new certs fails of employeetype === DISABLED
change HTTP 409 to 401 for api/provision
Merge pull request #99 from mozilla/issue98_ldap_employeeType

Merge in LDAP zimbraAlias check and employeeType checking code