Comma values in query cause LDAPLocalException

[RyanGaudion]

Might be related to #175 - When running the following code I receive the error below:

var searchFilter = "(&(objectClass=group)(member:1.2.840.113556.1.4.1941:=CN=Ryan\\, Gaudion,CN=w,DC=x,DC=y,DC=z,DC=com))";
LdapSearchResults results = (LdapSearchResults)connection.Search(config.SearchBase, LdapConnection.ScopeSub, searchFilter, null, false, cons);

Exception:
{"Type":"Novell.Directory.Ldap.LdapLocalException", "ResultCode":87, "Message":"Filter Error", "TargetSite":"Byte[] UnescapeString(System.String)", "StackTrace":" at Novell.Directory.Ldap.Rfc2251.RfcFilter.UnescapeString(String stringRenamed)\n at Novell.Directory.Ldap.Rfc2251.RfcFilter.ParseFilterComp()\n at Novell.Directory.Ldap.Rfc2251.RfcFilter.ParseFilterList()\n at Novell.Directory.Ldap.Rfc2251.RfcFilter.ParseFilterComp()\n at Novell.Directory.Ldap.Rfc2251.RfcFilter.ParseFilter()\n at Novell.Directory.Ldap.Rfc2251.RfcFilter..ctor(String filter)\n at Novell.Directory.Ldap.LdapSearchRequest..ctor(String baseRenamed, Int32 scope, String filter, String[] attrs, Int32 dereference, Int32 maxResults, Int32 serverTimeLimit, Boolean typesOnly, LdapControl[] cont)\n at Novell.Directory.Ldap.LdapConnection.Search......